Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed7427479ee49c2…

MALICIOUS

PDF

71.7 KB Created: 2020-12-26 00:24:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11396f8f6e0f8495e9bf80bc30aba3f7 SHA-1: 58fd88cc49c322d862c92eaa0c8728ca92c738b9 SHA-256: aed7427479ee49c2a193e89a3dbfd6e513c55b6a68e07b26694585e78ac14fe2
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, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or SEO manipulation attack, likely delivered as a spearphishing attachment.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/strik?utm_term=popularmmos+zombies+day+off+release+date
    • https://wazeketarawowaw.weebly.com/uploads/1/3/4/5/134587567/wulididofalo.pdf
    • https://wizitizisib.weebly.com/uploads/1/3/4/3/134361222/sarinipoj_fivax_kemobinurabeja_xerulopadoz.pdf
    • https://sidanarud.weebly.com/uploads/1/3/0/9/130969336/sesoxuwep-pixegugog-wugajufajusadez.pdf
    • https://cdn.sqhk.co/pitewomepe/hhVifhd/wedding_cakes_prices_and_pictures.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/63997a8c-304d-4916-a030-ec2835a2f2ef/cancion_rcp_nios_letra.pdf
    • https://s3.amazonaws.com/jefobexapulow/pogulanamafi.pdf
    • https://uploads.strikinglycdn.com/files/395a6a98-d735-402c-a953-36f87bb3e558/zofolokod.pdf
    • https://s3.amazonaws.com/visagogijulep/akcent_new_video_song_2017.pdf
    • https://s3.amazonaws.com/vasofirida/5e_celestial_warlock_guide.pdf
    • https://s3.amazonaws.com/lupuvogotog/96724509288.pdf
    • https://uploads.strikinglycdn.com/files/2992f504-359e-4396-b9fd-3e598170fe84/53849499804.pdf
    • https://uploads.strikinglycdn.com/files/e6899b24-f8a6-4659-bb07-4790dcb1b1c6/danumuzirofukewoforor.pdf
    • 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_off0000dac7.bin
49f76a83799a633ec55a42d6c063be264df25d299590fd1a1227f8fc7c7b3fd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 5480 bytes
font_01_sfnt_off0000ed5b.bin
e3c7a9e8a8c723a9f5e51bf3d2fa7777f020066446c7d9bbe78055a6dc91e3b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 10696 bytes