Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f23e33107b705f0…

MALICIOUS

PDF

71.3 KB Created: 2021-03-22 10:00:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42b4b26aafb2a341d655b059c27d3c4b SHA-1: 5be39f92801262fedd636ef822adb5d367deb0ee SHA-256: 7f23e33107b705f05ed9e0114a2f9bf4f7596d849aafbaa457a5c5f31090803a
176 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of external links, many of which are to benign-looking PDF files, suggesting a link farm or SEO poisoning attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in tech support scams or phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely related to phishing or scamming operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://zajinet.ru/wix?keyword=the+earth+school+kigali
    • https://cdn.sqhk.co/lojibuwe/JhaTLJZ/14397047820.pdf
    • https://cdn.sqhk.co/gazejuruni/hCY55ih/77997717706.pdf
    • https://cdn.sqhk.co/rojarasam/gj4jizm/sonic_the_hedgehog_minecraft_skin.pdf
    • https://tovijivesigaz.weebly.com/uploads/1/3/5/3/135327805/2556545.pdf
    • https://sobixalotebi.weebly.com/uploads/1/3/4/0/134017917/zedibesowazafevan.pdf
    • https://cdn.sqhk.co/zitiwofiru/MWbidge/rubber_duck_hunter_free_download.pdf
    • https://devarewiwigunum.weebly.com/uploads/1/3/2/7/132710712/418782.pdf
    • https://cdn.sqhk.co/dabigewom/fE88dhf/iowa_city_ia_storm_damage_today.pdf
    • https://zujujoweb.weebly.com/uploads/1/3/5/2/135297083/kelibanirodo.pdf
    • https://cdn.sqhk.co/nupepewomaxu/pji9fjd/math_worksheet_for_preschoolers_free.pdf
    • https://cdn.sqhk.co/nuroteditu/henhcr7/49195562891.pdf
    • https://cdn.sqhk.co/sixitigoxeto/UifLJWN/wazepasopuvof.pdf
    • https://gafeziluwer.weebly.com/uploads/1/3/4/3/134310472/9a7d3248b685.pdf
    • https://cdn.sqhk.co/galudubujuwa/hrjcij5/best_deal_zone_now_reviews.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fokapikow/improvisation_for_the_theater.pdf
    • https://s3.amazonaws.com/rudelazifizuvo/acetate_sheets_a2.pdf
    • https://s3.amazonaws.com/zerepuzuze/pojuxe.pdf
    • https://s3.amazonaws.com/ponivotigegepub/can_i_get_a_replacement_remote_for_my_roku_tv.pdf
    • https://s3.amazonaws.com/remuv/45503220562.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_off0000d771.bin
cc608c687b8e3219ad8037ef69c775422435f0a96956b64184140f5e12aa4f36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD771 5076 bytes
font_01_sfnt_off0000e8ae.bin
9812a1046ee8129ee8a9423eb9e76eb7319fa56a52bd07828fa4dc5427059eef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AE 10984 bytes

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