Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c269b6f6916bdf…

MALICIOUS

PDF

79.1 KB Created: 2021-03-24 16:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: b3429b61882a07f366c58c8c93efade6 SHA-1: 92140563adf946d220f797e2963ec89a74028bbe SHA-256: 80c269b6f6916bdffe251cb4fd34e64bfeb00b59dd8c70de5c9902d7edae5450
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a book summary, likely intended to mask the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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+compound+effect+by+darren+hardy+summary In PDF document text
    • https://static.s123-cdn-static.com/uploads/4387712/normal_5fee475ea8fed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369486/normal_5fc7128eddd87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454167/normal_6029fb349e2b6.pdfIn PDF document text
    • http://wiinorama.fun/walmart_black_friday_2020_ad_nov_27jf67b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446502/normal_5fde45b79c9c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_5fe73db26092d.pdfIn PDF document text
    • http://50offstore.info/85277966059wsyyt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366395/normal_5fde57eab2b9a.pdfIn PDF document text
    • http://heliusdesign.ru/pumux320tx.pdfIn PDF document text
    • http://hairsprof.ru/what_is_cfa_salary_in_south_africacvl0p.pdfIn PDF document text
    • http://neuroncraft.online/what_are_the_top_dog_names_for_2020v2f38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_60594f18750c4.pdfIn PDF document text
    • http://natlegend.space/what_are_the_qualities_of_christian_leadershipxn38n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4e5787-638b-4b5f-81c0-89c935055dc9/xanepaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b7ee16e-b017-4717-a4d2-462a4b8598d3/accu_chek_fastclix_lancets_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cedc231e-cd74-4648-930a-88c375c1303b/97076461234.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9abc01da-141d-461d-88eb-9168b6211cc6/gosan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab689846-8e00-4449-8cef-bded5c0da305/97356796204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d535ed0a-5a41-46c1-9a68-6361b5998085/hp_laserjet_1320_driver_windows_10_64_bit_free_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 5552 bytes
SHA-256: 915817b71bcfddbba348c306496a9da734e7e3662a6ed442cbbceecf05403ba4
font_01_sfnt_off00010862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10862 11168 bytes
SHA-256: f0a69d085368d9d431b0547f77d3f1323022fdfbebc5bc0b6e6fa89f78155ff7

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