Malicious PDF — malware analysis report

Static analysis result for SHA-256 502a10fc181e01f1…

MALICIOUS

PDF

86.6 KB Created: 2021-01-22 07:31:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ad4d8d0c4bf192df049604da39277c6 SHA-1: 2e7d0d9aaf24812efe4d286099ab7c1de6b9f349 SHA-256: 502a10fc181e01f1c54e2dfc6ba06d83ae8604a0109f53d1feeb2adfa0c8899d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files hosted on external domains. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs likely serve as a lure to a link farm, potentially for phishing or to host further malicious content.

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://traffking.ru/123?utm_term=isaac+newton+timeline
    • https://cdn.sqhk.co/gadewekunel/hdVAgc9/futudixezobino.pdf
    • https://cdn.sqhk.co/ninubisidire/itiiOij/crazy_taxi_classic_mod_apk.pdf
    • https://cdn.sqhk.co/rodisukipi/ijiaHfc/guitar_band_battle_tips.pdf
    • https://cdn.sqhk.co/feketukadoz/6aXvQih/liwinewazufonorebef.pdf
    • https://site-1217043.mozfiles.com/files/1217043/zomefemaxatetalalodewex.pdf
    • https://cdn.sqhk.co/tewokozogop/q5bjdFh/58196116721.pdf
    • https://cdn.sqhk.co/tiviluluje/UXgiief/undead_clash_of_clans.pdf
    • https://site-1177226.mozfiles.com/files/1177226/14601469280.pdf
    • https://cdn.sqhk.co/xexisini/jbDjd4H/marshmello_songs_list.pdf
    • https://cdn.sqhk.co/wufevinek/oQ2zchg/40989555943.pdf
    • https://site-1178049.mozfiles.com/files/1178049/dijanenugijelobu.pdf
    • http://xujilutobidiko.iblogger.org/bdd_full_form.pdf
    • http://zirosax.iblogger.org/78324238495.pdf
    • https://tefovaxosu.weebly.com/uploads/1/3/1/1/131163863/silok-zobelemulagod-wimusiwe.pdf
    • https://site-1254658.mozfiles.com/files/1254658/80316398484.pdf
    • https://site-1176294.mozfiles.com/files/1176294/votedolelosesowowepinuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jizubisetebof/liweneva.pdf
    • http://xegiseko.epizy.com/jazawibebawebi.pdf
    • http://jawuguv.epizy.com/52265696319.pdf
    • https://s3.amazonaws.com/tumasun/internal_payment_request_form_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108a6.bin
52d7385377e5a520b47cfafeb20ab17ac78ceca0ac5fd0476d88dfb107e1805c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108A6 4668 bytes
font_01_sfnt_off00011868.bin
b68d33d431806c19388a0a19442bb31fe25817346e280a1f2b68fb2263007172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11868 12220 bytes
font_02_sfnt_off00013f10.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F10 4324 bytes

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