Malicious PDF — malware analysis report

Static analysis result for SHA-256 686019c0b8e2392d…

MALICIOUS

PDF

82.9 KB Created: 2021-04-02 10:50:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2d2dfb41b758d8b8d1fdf3394ce0fec7 SHA-1: 96a2f4550b8a9ee9bb201cb34e51947d95524989 SHA-256: 686019c0b8e2392de0264ce36a2cf31d549484d52af1d85c315e413f923ce9a6
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on file-sharing services, suggesting a link farm or SEO poisoning attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of numerous external links and the nature of the heuristics suggest potential malicious activity, possibly involving JavaScript for exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dafemum.ru/strik?utm_term=the+urban+farmer+denver
    • https://bumovewadenol.weebly.com/uploads/1/3/5/3/135318567/waridafuxa.pdf
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/2d5a73099.pdf
    • https://pixipesigogod.weebly.com/uploads/1/3/4/3/134370637/legije_piwogovasetudol_bejejusabi.pdf
    • https://cdn.sqhk.co/baxorurifina/hijIGif/elite_killer_swat_mod_apk_offline.pdf
    • https://cdn.sqhk.co/zezinojox/ihB6Iii/jungle_run_2020.pdf
    • https://cdn.sqhk.co/fumamimed/bjhidbc/gapadifalupuxoxuxifigeme.pdf
    • https://poteluteko.weebly.com/uploads/1/3/1/1/131164474/pixukotonat_vafubaneguwozad_ruxotufimumatuk.pdf
    • https://saguwaxofules.weebly.com/uploads/1/3/2/6/132681351/dujemelazu_xaruvibene_lezabileli.pdf
    • https://tatelemu.weebly.com/uploads/1/3/1/1/131164239/raledola.pdf
    • https://cdn.sqhk.co/nezerozara/bjgWXjh/jovetepuvekenovodopi.pdf
    • https://pekatube.weebly.com/uploads/1/3/5/3/135393066/824d9b9a0afe.pdf
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/8055748.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/55be3c69-b4ad-4346-9736-45a3172c57d2/where_can_you_buy_a_timex_watch.pdf
    • https://uploads.strikinglycdn.com/files/8086e58f-90ac-42ec-8d9f-71cebb7b3581/miminesa.pdf
    • https://uploads.strikinglycdn.com/files/1a349142-2154-43c3-895e-362aa33468fb/mojopejoz.pdf
    • https://uploads.strikinglycdn.com/files/c1b5d93b-b9f9-4606-aaa8-cac7d6f7c645/research_proposal_examples_biology.pdf
    • https://uploads.strikinglycdn.com/files/ccab2935-2aee-4962-8d55-64fe75033d66/netgear_fvs318n_vpn_setup.pdf
    • https://uploads.strikinglycdn.com/files/f22a18e7-1cc5-473e-b445-51dc565d4ca7/how_to_start_a_introduction_paragraph_for_an_essay.pdf
    • https://uploads.strikinglycdn.com/files/f58b1d54-71fc-4bdf-8557-4bc1004c080b/what_does_conceptual_unity_mean_in_art.pdf
    • https://uploads.strikinglycdn.com/files/d406b4d7-238e-45d1-8d1c-5c635e31a817/sanidry_xp_repair.pdf
    • https://uploads.strikinglycdn.com/files/80a1e2fc-c4b0-4c4e-b5e4-587002f766b2/where_can_i_donate_plus_size_womens_clothing.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_off0000f7cc.bin
e5945edd1305997a022d07048b69d45ba91bc07f6e6556872d9d2cad570d30c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 4732 bytes
font_01_sfnt_off0001079e.bin
ac4c2e5635df6912c58fd53694e90158caad5606ed3699efdc620345fedcc5ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x1079E 12220 bytes
font_02_sfnt_off0001303d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1303D 4324 bytes