Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eb2a02be40413c8…

MALICIOUS

PDF

83.6 KB Created: 2021-04-20 22:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4e0a21d1dcbea204971a071de92183c4 SHA-1: d03c2f9dec44fcc425f5369631842b8e23440e4f SHA-256: 4eb2a02be40413c8e42b895cb4153cea3f7b30912366dd6ee56ab25303507098
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, 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 manipulation tactic. The embedded content, though heavily obfuscated, likely serves to redirect users to these external URLs, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://gimoguvi.ru/strik?utm_term=linking+words+list+with+bangla+meaning PDF link annotation
    • https://nibovipuduri.weebly.com/uploads/1/3/0/8/130814681/vexepenuni-zunivit.pdfIn PDF document text
    • https://sanajupa.weebly.com/uploads/1/3/1/4/131406847/jifalidi-xejubositabe-xoxakukuro-wekogixoka.pdfIn PDF document text
    • https://tuzopukerokep.weebly.com/uploads/1/3/5/3/135347688/nasiniwidu.pdfIn PDF document text
    • http://velesvoyage.ru/28441157274s85g1.pdfIn PDF document text
    • https://jematujevuzonip.weebly.com/uploads/1/3/4/2/134235480/4147173.pdfIn PDF document text
    • https://sivusemekatew.weebly.com/uploads/1/3/4/4/134491367/foralakatevi.pdfIn PDF document text
    • https://mijutadozas.weebly.com/uploads/1/3/4/5/134590660/nixeleziruronovub.pdfIn PDF document text
    • https://rofasotukez.weebly.com/uploads/1/3/0/7/130740205/282a145.pdfIn PDF document text
    • http://visionnew.xyz/arduino_nano_every_pinoutairf6.pdfIn PDF document text
    • https://wadaletabuj.weebly.com/uploads/1/3/2/6/132695896/lelutusize-polakojasas.pdfIn PDF document text
    • http://characduwe.space/ley_de_ohm_formula_y_unidadesr9o5y.pdfIn PDF document text
    • https://futikixuvezat.weebly.com/uploads/1/3/3/9/133986242/d65ab2ca.pdfIn PDF document text
    • https://sigojexubaj.weebly.com/uploads/1/3/2/6/132682800/jelavor-kibowi-dezezol-zixepowe.pdfIn PDF document text
    • http://sysfix.ru/a_monster_in_paris_characters_wikiqave1.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/3d1a42eb-8842-4914-85ac-67afba64b45d/epson_wf_2530_setting_up_wifi.pdfIn PDF document text
    • https://fb79ad55-22b5-4823-9538-35c71bbbd514.filesusr.com/ugd/ea423f_c56c14cfa3094a9eb8c39e0b92a07b94.pdf?index=trueIn PDF document text
    • https://b64dd490-e5b9-492f-89ff-e398ecee904c.filesusr.com/ugd/5926b4_10fbc3fc1a0e48fa8ced5c893b955762.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8344d9-9ad9-4283-990d-542033174f72/radical_acceptance_tara_brach_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b9fa072-b9b8-4e07-884a-40a81769d335/kokubetibusop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59d4360c-b6a3-4212-88c7-4e1ff3852cf0/34830456643.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_off00010a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A89 5476 bytes
SHA-256: 137ee3258d503ac34360c77cb72e4e6cea25fbb15f4b90798f93d224212e5681
font_01_sfnt_off00011d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D14 10416 bytes
SHA-256: cf36836c7404a4c2a2f48295191a1ea5ce701ebfcc36162dade8104e3bcd844a

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