Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1152c9c683f7d3…

MALICIOUS

PDF

76.9 KB Created: 2021-06-01 21:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43766b237963e904b54018c7026efd5d SHA-1: 280974489c3747e1f7f40f9ae968529af3b242f0 SHA-256: 4e1152c9c683f7d3044354111471a9a549f091ee8f327d5bbc7cbaa78d73240b
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary URL, 'https://garglob.ru/pbw?utm_term=best+fb+auto+liker+apk+download', suggests a phishing or malware distribution attempt disguised as a resource for downloading an 'auto liker' application. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/pbw?utm_term=best+fb+auto+liker+apk+download
    • https://cdn-cms.f-static.net/uploads/4378834/normal_5fdabac4c94a9.pdf
    • https://cdn-cms.f-static.net/uploads/4422382/normal_60581295b6865.pdf
    • https://cdn-cms.f-static.net/uploads/4428038/normal_600fba5c2c0f5.pdf
    • https://kajizifobizixa.weebly.com/uploads/1/3/3/9/133997117/mekemebaboliduwapo.pdf
    • https://cdn-cms.f-static.net/uploads/4388040/normal_5fe7881bd5e25.pdf
    • https://static.s123-cdn-static.com/uploads/4402940/normal_5ff0a791ee86b.pdf
    • https://static.s123-cdn-static.com/uploads/4464534/normal_5fdfac24273df.pdf
    • https://cdn-cms.f-static.net/uploads/4408479/normal_606477706aac7.pdf
    • https://jozufibajas.weebly.com/uploads/1/3/0/9/130969385/7689518.pdf
    • https://judexibegajojid.weebly.com/uploads/1/3/4/8/134885636/c550f.pdf
    • https://xonunomimir.weebly.com/uploads/1/3/2/6/132681278/1e3993.pdf
    • https://cdn-cms.f-static.net/uploads/4417537/normal_602ca457dbbce.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/9d7eab94-f7b4-4e19-8997-257822c0489b/what_is_galarian_rapidash_weak_to.pdf
    • https://uploads.strikinglycdn.com/files/204335c8-f4bb-4c04-a8fe-effb08daa124/voxozuxetekixake.pdf
    • http://wiwedano.pbworks.com/w/file/fetch/144427302/how_to_prepare_moringa_tea_for_weight_loss.pdf
    • http://niwomif.pbworks.com/f/shree_krishna_govind_hare_murari_ramanand_sagar_mp3_download.pdf
    • https://uploads.strikinglycdn.com/files/606577cc-94c8-4730-a92e-8c41b55162af/51146300827.pdf
    • http://kufogokoges.pbworks.com/w/file/fetch/144434469/how_much_is_sheetrock_per_sheet_at_home_depot.pdf
    • http://niwomif.pbworks.com/f/xutiwif.pdf
    • https://uploads.strikinglycdn.com/files/5f28e3e5-3a7d-477f-ab30-b3a4c1991b00/pesquisa_bibliografica_segundo_lakatos_e_marconi.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_off0000ec85.bin
8e3c0374879c7a88c1edfc1d49681d1926f576aaf2187ff9fcf0c922de73132f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC85 5380 bytes
font_01_sfnt_off0000fef0.bin
e776067bcd3e4cbea3b1867b4eca7ad75ca95a4071a0b38b857a632a1914c08a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF0 11084 bytes