Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9a637273bdaecb…

MALICIOUS

PDF

79.1 KB Created: 2021-02-12 19:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 818e981e9cafe2bb2f8e031666fc3ec1 SHA-1: b8c9509887f2056bcf898251c9f15fc16c1a73b1 SHA-256: cb9a637273bdaecbea6095754c9aa9bc9509e0fef5d541088e38094fe69214f4
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with the primary malicious URLs being maypoin.ru and se-mrush.com. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://maypoin.ru/123?utm_term=group+4+elements PDF link annotation
    • http://se-mrush.com/27646764240xg965.pdfIn PDF document text
    • https://cdn.sqhk.co/lugizumevemu/ibgjC4p/juwof.pdfIn PDF document text
    • https://duzetokip.weebly.com/uploads/1/3/4/4/134404829/notizadapawagix.pdfIn PDF document text
    • https://powotatetodo.weebly.com/uploads/1/3/0/7/130738650/vavezivezafite-fegusuwebo-zivozo-rawosoxugi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_600f88732558b.pdfIn PDF document text
    • http://lovechat24.club/lineage_2_high_five_bishop_guidedeb11.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480145/normal_5fdc20f598716.pdfIn PDF document text
    • https://cdn.sqhk.co/woteruzid/RBw2Chj/77886230121.pdfIn PDF document text
    • https://duruzamuxe.weebly.com/uploads/1/3/2/3/132302842/jasara_soloweroluvegos_tekavozu_sadekezumamezi.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/LMPhbhc/78996946093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472760/normal_600c0da507b54.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://s3.amazonaws.com/limewub/bandcamp_er_online_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/spanish_alphabet_pronunciation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/jexijer/game_breakneck_mod_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/83628284048.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/adobe_flash_player_mac_chrome.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/rivoduf.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_off0000ee92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE92 4708 bytes
SHA-256: f3ae3887d12bb512e5222830685674ac18b341d88eb4a4d36be963a643529b0c
font_01_sfnt_off0000fe88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE88 10100 bytes
SHA-256: 471bc8b1e467ccaaf8b7171c0b8f27939c325937909e21bf2852a1369e79ab08
font_02_sfnt_off00012125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12125 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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