Malicious PDF — malware analysis report

Static analysis result for SHA-256 156fe74182ae69c7…

MALICIOUS

PDF

68.9 KB Created: 2021-04-04 08:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 53b1b81c36325ae880d887b9a73229ed SHA-1: f673af3c4299af6dbb75e10506cb751bf1cbcf2b SHA-256: 156fe74182ae69c73c24adf2f9e1b4ecf8e04df84b572e715ef78ed7e81aa699
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, with a high ML score and ClamAV detection indicating malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a phishing or SEO spam campaign. The document body is heavily obfuscated and appears to contain junk data, but the presence of embedded URLs points towards the primary function of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/wix?keyword=sleeping+ute+mountain+rv+park PDF link annotation
    • https://cdn.sqhk.co/gizoxemovefi/bPptoji/giguxisiz.pdfIn PDF document text
    • https://cdn.sqhk.co/mozulunilex/ghhajaD/whatsapp_status_balochi_song.pdfIn PDF document text
    • http://rasidafepu.mypressonline.com/sajejosixogo.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/wobosi.pdfIn PDF document text
    • https://rokufekajo.weebly.com/uploads/1/3/0/8/130814342/1108562.pdfIn PDF document text
    • https://bovimifukid.weebly.com/uploads/1/3/4/8/134882826/1f6d7cde9.pdfIn PDF document text
    • https://lazofakivew.weebly.com/uploads/1/3/1/4/131406449/poganot.pdfIn PDF document text
    • http://kevebofuru.medianewsonline.com/80192810338.pdfIn PDF document text
    • https://cdn.sqhk.co/boxokozofe/2yjh3o7/hello_neighbour_act_3_basement_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_60bed696a60f4a94b24245fec7bd46bd.pdf?index=trueIn PDF document text
    • http://xivemowapevi.rf.gd/21365183178.pdfIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_fa9175015bb04ef5be7a5072c2a0e214.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_c1a7e2e1e7c04620b1b58161b2002837.pdf?index=trueIn PDF document text
    • http://genigasoferu.rf.gd/why_does_rachel_not_wear_a_bra_in_friends.pdfIn PDF document text
    • https://04a80c79-134c-446e-801b-0c1635678e59.filesusr.com/ugd/5cebf8_7bcb402024c2494baeb0643efb73183b.pdf?index=trueIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_c743d18d2a60498f82a4f05f40828078.pdf?index=trueIn PDF document text
    • https://6843e3eb-5573-46e1-90a0-370cfc2b4a0d.filesusr.com/ugd/89b1bc_8a2c0728c8a74df39fde5197efadc3eb.pdf?index=trueIn PDF document text
    • https://c7e723d0-7712-45a3-a8dd-8d8935e7c5e2.filesusr.com/ugd/c4f451_9a249e98526f40eb802567a344122df5.pdf?index=trueIn PDF document text
    • http://divasopib.rf.gd/nibeluzagakejakoropejan.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_off0000d0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A6 5188 bytes
SHA-256: 78b248ca90fc7eb0ff255003c48e39b33b9855c9b6028c091a23b90504e98dc2
font_01_sfnt_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 10540 bytes
SHA-256: e889f4b8adce354c5e99d2386f81fa5575a2ab3e7039423d6932eb68a2a0807c

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