Malicious PDF — malware analysis report

Static analysis result for SHA-256 9063aefaf8743926…

MALICIOUS

PDF

84.0 KB Created: 2021-03-14 09:08:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: aa04748192e9ad00dabd90236b8e8d2e SHA-1: 412f6fbf465c93045fe7b6adc2947b51f6381b6c SHA-256: 9063aefaf87439260b5310e4d090cfd82e1f2d436da7d729a7175a312880b2de
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous external links, with one notable URL being https://gimoguvi.ru/strik?utm_term=what+do+power+structure+mean. The document body, though heavily obfuscated, appears to be related to the deceptive title, suggesting a phishing or SEO-based lure. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/strik?utm_term=what+do+power+structure+mean PDF link annotation
    • https://malitorenifavo.weebly.com/uploads/1/3/4/0/134017021/6151106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463824/normal_5fcbf9583fa9a.pdfIn PDF document text
    • https://pufoxedoj.weebly.com/uploads/1/3/4/4/134438994/nujidelimagimux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5fe8b975989b9.pdfIn PDF document text
    • https://rejudizik.weebly.com/uploads/1/3/4/7/134701546/rivisavugile.pdfIn PDF document text
    • https://vexefanakaxaki.weebly.com/uploads/1/3/4/8/134871487/9638817.pdfIn PDF document text
    • https://wagigezo.weebly.com/uploads/1/3/0/7/130775958/tofivavepiroz_gokogudoposas.pdfIn PDF document text
    • https://danodukuwen.weebly.com/uploads/1/3/1/6/131637043/2589413.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466996/normal_5fca0f1ac4068.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459328/normal_5fdea1874b7e6.pdfIn PDF document text
    • https://wubedalenab.weebly.com/uploads/1/3/1/3/131383767/wovul.pdfIn PDF document text
    • https://jopixedojowagi.weebly.com/uploads/1/3/4/8/134852439/zonuduloterexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471985/normal_6048eac12ee47.pdfIn PDF document text
    • https://jasefukop.weebly.com/uploads/1/3/0/7/130776564/0419953a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7fc08826-b3b0-47bc-8f00-e61563e088d3/what_are_the_three_types_of_marine_ecosystems.pdfIn PDF document text
    • https://d80868e2-5d34-4dda-9345-0396294a35aa.filesusr.com/ugd/f9fac6_4184b21192bd43e9b3236ac99e758c67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb865a0b-40bf-471c-82e4-b329127caca3/39717971635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fbbc518-2921-42c5-a4b1-e0feba1d621c/how_much_is_charisma_university.pdfIn PDF document text
    • https://7b4e975e-109f-4397-a679-93e438ff1453.filesusr.com/ugd/c33f71_3149f123e0cb425f9568fcabb63db0c7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/679e6694-4b91-454b-b6de-2fc33c039695/sotobezu.pdfIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_ae28364c200c418d9c52308452be90d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3c9cbf4-94f2-42f4-9a26-1592867aded1/29438059232.pdfIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_ddf7ab4845ad44f59fe920ed795c1243.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e0784b3-ae06-4e4a-863a-bee8343c6c6a/kung_fu_hustle_cast_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d742f60-c089-42c4-9a15-29681178bb87/94451069787.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 5220 bytes
SHA-256: caababdf11016b2a3957fbe4c5431be2aa0927a35c83cbb783445188b6c951fe
font_01_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 13856 bytes
SHA-256: e979982ead3c0b32d6a5a93c1f850c2d677dd2c1161f6176b2e5864e78d3070a
font_02_sfnt_off0001329d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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