Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bc42567c2f4977…

MALICIOUS

PDF

90.3 KB Created: 2021-02-20 17:41:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: aad507fa2b108eb54b33d0a4b49e1795 SHA-1: d68649ba59825b30a659dca5c475866bc798085e SHA-256: f8bc42567c2f4977310fdf6b0f994b10ceac8ab88749899b23ff10a29f11bca4
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The document body, though heavily obfuscated, contains text fragments related to printer maintenance and book titles, suggesting a lure to trick users into clicking malicious links. The presence of numerous links on disposable hosting further supports a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=hp+photosmart+plus+b210+clean+print+head In PDF document text
    • http://reduslim-eu.site/stephen_hawking_books_lista1tx5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454054/normal_5fd1ec0ad18f8.pdfIn PDF document text
    • http://bikuribowe.22web.org/pidera.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476952/normal_5ff4d4443fd41.pdfIn PDF document text
    • http://manthoughtswebsite.website/ignited_minds_in_telugumbkc6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481064/normal_5fec4e7e6cd8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413238/normal_6013bd120aaac.pdfIn PDF document text
    • https://jukusixod.weebly.com/uploads/1/3/1/4/131483076/fuzotamonob.pdfIn PDF document text
    • https://kifesajisibak.weebly.com/uploads/1/3/4/8/134884742/medizexa.pdfIn PDF document text
    • http://vezerfa.xyz/paradox_key_genckx4o.pdfIn PDF document text
    • http://zalavsky.ru/fesovafujotoxibaxek9gh8l.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449419/normal_6018f85a403e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufiziwo.rf.gd/bronchiectasis_management_guidelines_australia.pdfIn PDF document text
    • http://ninanupazazudad.rf.gd/acknowledgement_template_research.pdfIn PDF document text
    • http://febarufowit.epizy.com/rikodepomijesige.pdfIn PDF document text
    • http://demoxivefuwuvi.rf.gd/android_fragment_callback_null.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/53967181179.pdfIn PDF document text
    • http://nenimon.epizy.com/jadefuxikogewu.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/94608357364.pdfIn PDF document text
    • http://wojalurume.epizy.com/physics_1_for_dummies_download_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/86871235514.pdfIn PDF document text
    • http://velosipu.epizy.com/37752674609.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B7 5740 bytes
SHA-256: 4b1c9a13b5e8a950e4fdb307a8ae0fb17107cc204f184f602e36bdd666118951
font_01_sfnt_off0001360e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360E 11580 bytes
SHA-256: 3e5b29c83b5841b19c7b2e019c232dea7a26520b50c3bf336d423343a0172fc9

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