Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa46356f3bc73fd7…

MALICIOUS

PDF

80.3 KB Created: 2021-01-21 18:21:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 88598b75f0b12c85a462ef80ef665a3d SHA-1: 9c8c5eb2ae7aaac60457c6a96a7304288379ec72 SHA-256: aa46356f3bc73fd7b36470316d81a2928027ccf002174de33caf383f02d08be8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine results or direct users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://seumenha.ru/123?utm_term=parlee+z3+geometry PDF link annotation
    • https://site-1171522.mozfiles.com/files/1171522/dining_room_chairs_set_of_8.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/bib3gju/autotrader_denver_nc.pdfIn PDF document text
    • https://budojidotepaso.weebly.com/uploads/1/3/5/3/135312143/bfbb48e1.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/1jc14OW/ninja_foodi_recipes_chicken.pdfIn PDF document text
    • https://site-1173857.mozfiles.com/files/1173857/22676417166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444095/normal_5fd84d26702e2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372074/normal_5ff435ecdb394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459468/normal_5ff29464e671b.pdfIn PDF document text
    • https://cdn.sqhk.co/werutojij/xtggjf4/cosmis_racing_xt-_006r_350z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5fd63dd960450.pdfIn PDF document text
    • https://site-1237926.mozfiles.com/files/1237926/santa_baby_sheet_music_violin.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459060/normal_5fec0748cbdc8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366309/normal_5ff7692d262be.pdfIn PDF document text
    • https://site-1174882.mozfiles.com/files/1174882/check_browsing_history_on_android_phone.pdfIn PDF document text
    • https://site-1249195.mozfiles.com/files/1249195/how_to_answer_thank_you_in_french.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401505/normal_60059248d208e.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/2nP2Cgi/asphalt_nitro_online_mod_apk_techylist.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378852/normal_5fe1d0a2886d4.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/xovajukoxin/boxusutamapodixojaza.pdfIn PDF document text
    • https://s3.amazonaws.com/dafumuxitupav/florian_grillitsch_scouting_report.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_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 4780 bytes
SHA-256: 26e849ec5bc9e92b30225d662644a8137da48f2b8dd91394c99fdf0334cf8d02
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 11028 bytes
SHA-256: 883a76bdbec4e955aee8e5b7b813211d1cf8e2c7fa3f0c593f5502eb480cb2d6
font_02_sfnt_off000125a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A6 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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