Malicious PDF — malware analysis report

Static analysis result for SHA-256 880a512ba7958812…

MALICIOUS

PDF

76.5 KB Created: 2021-04-04 11:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e23ab3b2d6fca048ec8130cd2ce2c951 SHA-1: 5f229438bb975ed6206cb10ad9215c582db83c18 SHA-256: 880a512ba79588126e08366d43fbcf72008a4af392cb87743aae467e64693503
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO spamming operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/award?keyword=altruismo+definicion+psicologia+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vudivuzakal/97216180120.pdf
    • https://16fd32d6-95e0-4b29-89ad-7162b4f2ffbe.filesusr.com/ugd/9f4b57_d8c4bd8a9abf45e5b9c604a3d10c65f6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/aa2d65c5-f783-4188-b456-5948cc2cd1b1/where_are_frigidaire_chest_freezers_made.pdf
    • https://s3.amazonaws.com/podawakumepewez/80041170584.pdf
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_278f118ecd614fdebd6fe53ae1e80e53.pdf?index=true
    • https://a80c0318-1640-4d50-a016-df037fc402b9.filesusr.com/ugd/895bef_64e21f4a512a4c08a33196947680577c.pdf?index=true
    • https://s3.amazonaws.com/wofaxil/20331432152.pdf
    • https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_5d2b795c940244e0a9505952afb86a48.pdf?index=true
    • https://5c2df1de-05ea-4e17-9aa3-38adc7ce3153.filesusr.com/ugd/ddd609_4f9aac4b7bb14086919fae40b1271f8e.pdf?index=true
    • https://s3.amazonaws.com/najipavez/the_moral_landscape_sam_harris_reddit.pdf
    • https://uploads.strikinglycdn.com/files/8799514a-5a5d-4ed9-9326-d0f2221ab479/poor_mans_james_bond_vol_5.pdf
    • https://8316a071-1c81-4729-bbc9-bb84f51c1359.filesusr.com/ugd/b2ba6b_a8e57929d8ff4dc58d183e9b5af0828f.pdf?index=true
    • http://xevivalekivo.epizy.com/5527728972.pdf
    • https://uploads.strikinglycdn.com/files/3f932e1e-6b29-411d-bc71-2c231c859416/is_yagami_light_a_shinigami.pdf
    • https://2d2b1dae-c014-4902-97e6-c3f1d56915cd.filesusr.com/ugd/70e5f7_8b8893b23ed846beb1b3d1ddafecd4d1.pdf?index=true
    • https://s3.amazonaws.com/remavuj/how_to_play_fantasy_basketball_categories.pdf
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_452aefcc8ab7420b8c08f7f749e96c01.pdf?index=true
    • https://s3.amazonaws.com/jupoti/52612332559.pdf
    • https://s3.amazonaws.com/sugowubuf/happy_birthday_cake_pic.pdf
    • http://jeronegiwok.rf.gd/mewefe.pdf
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_e8780e7a9ff943b0a8a9c57ab403601b.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c2.bin
c52027a133ec9f40c39a7a037a3465f4f9c9490b0f8dde0ea01271891e6edfd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C2 5464 bytes
font_01_sfnt_off0000fc41.bin
39ce1c36994f97d9142631a83dc7c0fa3627b5cca5c99c71fef3c0f0e8a1e33b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC41 11816 bytes

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