Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c1c2c52b1f601a…

MALICIOUS

PDF

81.0 KB Created: 2021-02-21 23:37:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4f100a35717b0df5a576b3ea140e5928 SHA-1: 3ba5c22bf99625932f09f63c761465256481195e SHA-256: 79c1c2c52b1f601a5ee235eda0e1ebd51096b2698111262cfbc59d5e5fab550e
184 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to the embedded URLs, suggesting a phishing or scam attempt. The numerous embedded URLs point to a link farm strategy, likely designed to distribute malware or phish for credentials.

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://crophysi.ru/wix?keyword=how+to+manual+focus+olympus+omd In PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_601cbfeb5dc59.pdfIn PDF document text
    • http://ejinaya.com/jar_of_hearts_pianovokjf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485172/normal_5fcbe22416043.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/leatherworking_classic_guideftjof.pdfIn PDF document text
    • http://pedrons.space/banawoxozolufolukl4n9l.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/hd598Mb/bare-_knuckle_fighting_championship_13.pdfIn PDF document text
    • http://kawlites.online/angular_7_formdata_emptyy9im8.pdfIn PDF document text
    • http://odemebayisitrafik.com/puxakaladakogumilimitoz4s8sc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383132/normal_60045f4f14600.pdfIn PDF document text
    • http://trackcreditscore.info/60013386478chiy3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403818/normal_602e84bdd5ecc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416495/normal_601dc084544d2.pdfIn PDF document text
    • http://proita.space/rachmaninoff_prelude_g_sharp_minor3dux4.pdfIn PDF document text
    • http://4gusevshop.website/32277429909owkjc.pdfIn PDF document text
    • http://klossheff.xyz/adjectif_interrogatif_quel8hdwa.pdfIn PDF document text
    • http://esportzmlevent.com/exercices_sur_les_fractions_dcimales_cm2vwm5t.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/eBhiUgj/hop_step_jump_movie_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/i6hiqo1/94038327138.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEABE 5360 bytes
SHA-256: 0870c1abf81f4d2500873abfd52e7099fec449a92913d413921efdfa00cc73cb
font_01_sfnt_off0000fd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD04 10324 bytes
SHA-256: f674264038da49be6e8fa45f7cbf3986aa9ab142d9e5d27adad114397184a380
font_02_sfnt_off0001205f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205F 16336 bytes
SHA-256: 4c546d31c579de887a25148404dfd84a1d3ee202a243da1a388503521d3f565a

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