Malicious PDF — malware analysis report

Static analysis result for SHA-256 a74d624f7041f81c…

MALICIOUS

PDF

67.3 KB Created: 2021-03-30 19:09:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d265b08b2b8728ee22c8fba4f59726ad SHA-1: 2c5a511a3621cde1640cbea9cde55b8bd7d7f6d1 SHA-256: a74d624f7041f81c42f05c7cfbfde7bf7d39362ae199815a5f23a722986d5b10
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains references to 'Microsoft excel certification study guide free', which is likely a lure to attract users to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/123?utm_term=microsoft+excel+certification+study+guide+free
    • https://sibolapitabake.weebly.com/uploads/1/3/4/4/134469628/1514209.pdf
    • http://artistichomesolutions.com/28046203175wr4bb.pdf
    • https://nafogoke.weebly.com/uploads/1/3/4/7/134776139/wufuzutija.pdf
    • https://xefikusog.weebly.com/uploads/1/3/5/3/135390274/1090276.pdf
    • https://rajopolaxobi.weebly.com/uploads/1/3/1/4/131406270/4e2b1b0865.pdf
    • https://static.s123-cdn-static.com/uploads/4402718/normal_5ff6620632f15.pdf
    • https://lotaximadezepa.weebly.com/uploads/1/3/1/3/131379514/958027.pdf
    • https://cdn.sqhk.co/jaguwubax/QPjaifE/way_of_retribution_awakening_2._038_mod_apk.pdf
    • https://pegigisujojefuf.weebly.com/uploads/1/3/1/4/131413718/bifaxafedolerurig.pdf
    • https://dalujukonuxuda.weebly.com/uploads/1/3/1/1/131163933/52302.pdf
    • http://frasqen.online/xabunakesavisivosulami1zgyt.pdf
    • https://xugomijomib.weebly.com/uploads/1/3/4/5/134578432/jobanulofe.pdf
    • https://cdn.sqhk.co/resesexiraf/jbuXJea/dungeon_keeper_amiga.pdf
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/gajonetazexaxixa.pdf
    • https://mapijilut.weebly.com/uploads/1/3/0/8/130873952/fujukuwidipawag_tunolulus.pdf
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/54dfd4ac0.pdf
    • http://bitcoinchat.fun/masque_of_the_red_death_quoteswlm1u.pdf
    • https://cdn-cms.f-static.net/uploads/4447646/normal_601dd76c176ec.pdf
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/6097974.pdf
    • https://ziziwatir.weebly.com/uploads/1/3/4/7/134713039/3176092.pdf
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/wovomagu.pdf
    • http://shopsmmv.site/baby_trend_ez_flex_loc_infant_car_seat_manual7lfzs.pdf
    • https://static.s123-cdn-static.com/uploads/4423430/normal_5ffbbb405b972.pdf
    • https://static.s123-cdn-static.com/uploads/4428039/normal_5fe223d7c4013.pdf
    • https://cdn.sqhk.co/pubodegosog/GxmF6jj/lebajunov.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000cc9b.bin
5d91fc91216243b08602ffa179556ab5442afbcdcd34f86307a03ab3c28771c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9B 5364 bytes
font_01_sfnt_off0000df05.bin
eeefb32b6dd28d62932e532d88ab7e100544042f1fd5bde51b352dad1d4d2d0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 9412 bytes

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