Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0f51ab0b04619b2…

MALICIOUS

PDF

68.6 KB Created: 2021-03-10 03:31:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d1593e22015b9baf0465e08279519fe6 SHA-1: d9f898dbb25261457b7341573104bed862946e65 SHA-256: c0f51ab0b04619b2b2818664be8833aa7ded56fc3ac0496aa6283987224fd13b
156 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 PDF contains a large number of external links, many of which are part of a link farm, suggesting an attempt to direct users to potentially harmful websites. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/award?keyword=sports+equipment+vocabulary+exercises+pdf PDF link annotation
    • https://cdn.sqhk.co/pifajaloro/3HicNhd/wedotaluwirubenudubewuwob.pdfIn PDF document text
    • http://helpforteam.com/kinawixepuwowigomepegabk9hrt.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/QCgiEhe/71772908729.pdfIn PDF document text
    • https://gulufoge.weebly.com/uploads/1/3/0/7/130776817/3439304.pdfIn PDF document text
    • https://cdn.sqhk.co/winogolelog/gixWVic/save_us_president_movies.pdfIn PDF document text
    • http://soldonlittleton.com/anastasia_soundtrack_broadway8z584.pdfIn PDF document text
    • https://najovukuno.weebly.com/uploads/1/3/1/4/131453374/wimave_fajozaluzeteron_supupaxi_wabadesabalas.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwuzuwix/hVicfjW/how_to_write_a_business_proposal_email_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/zimuteraf/jhe3idX/kagekufetugajija.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c22fe9f8-b12d-4c3a-81b7-8100eb6d4723/what_kind_of_oil_does_a_honda_accord_take.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/82105902027.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab3d7051-564d-4795-9676-72a72457fe63/91992167872.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/38607652032.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/canadian_diabetes_guidelines_statin.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/tetewiraseso.pdfIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/xobupifivave.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/dragon_ball_legends_team_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/the_benefactor_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/human_anatomy_atlas_software_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ffb47ed-5780-4e42-b222-577245b66463/39295836732.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_off0000cd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 5900 bytes
SHA-256: 8886d5b8d183417755e034661287e079b38c31e747db52874ac92bd4ef10d1d6
font_01_sfnt_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 10384 bytes
SHA-256: df0443f316454a058d78c95c47d2cef00784f39037c06b5d9b2e513db333f49a

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