Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a5cf2a1647195e…

MALICIOUS

PDF

82.1 KB Created: 2021-05-03 21:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 703f7e7071895493ab38e92da5a90786 SHA-1: 8710c9fa30ecb848e97eb81db77655340597b530 SHA-256: 13a5cf2a1647195ecb408e43c6afcaa5fdeba0d856a429f1630b8d1abbcc67ed
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM' that points to a large number of PDFs. One of the primary external links, https://ponafet.ru/strik, appears to be a malicious URL. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were directly extracted, the structure suggests an attempt to manipulate search engine results or redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://ponafet.ru/strik?utm_term=the+calculus+7+leithold+pdf+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501777/normal_600f588abedb6.pdfIn PDF document text
    • https://mulevemi.weebly.com/uploads/1/3/4/7/134754511/8178963.pdfIn PDF document text
    • http://byseles.xyz/7169891406296sb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462696/normal_5fe61a5687839.pdfIn PDF document text
    • https://bileravufal.weebly.com/uploads/1/3/4/7/134749654/dijizi.pdfIn PDF document text
    • http://knitfqph.site/significado_de_latisha_origem4md8j.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/d16ead09c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/baposivarabuj/solidworks_2010_full_crack.pdfIn PDF document text
    • https://26bfc7ce-baa4-43a1-9280-72312523cbd3.filesusr.com/ugd/5af86b_bb68b2c7c2ef428db3a12dec94a8d6cb.pdf?index=trueIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_32a69afc9c184a5da9e313f2a5de3354.pdf?index=trueIn PDF document text
    • http://sojasajejob.rf.gd/gapilegebovanofutufi.pdfIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_cf3afb2946754317a9d9210304156dff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/favujisitevowoxazeti.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/xosurofanoji.pdfIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_6f4faf46549c48e6bc5db9334dfcc0d0.pdf?index=trueIn PDF document text
    • http://sexikajizetux.rf.gd/94889331200.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/tyt_th-9800_modifications.pdfIn PDF document text
    • https://22449060-8e30-4723-8828-967625cce342.filesusr.com/ugd/eddc50_6a53343e022c47df93eeb11f90df2a2b.pdf?index=trueIn PDF document text
    • http://luvoximod.epizy.com/how_to_change_background_color_in_photoshop_cs6.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/nunaw.pdfIn PDF document text
    • http://xonelamurojili.rf.gd/correct_address_format_singapore.pdfIn PDF document text
    • http://zumoxevozasumek.epizy.com/95921701616.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 5048 bytes
SHA-256: 0d18c75d2113d9c995cd9c789db9faf718bc3d0eb4754e580ca4fd5842357531
font_01_sfnt_off000108e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E1 10664 bytes
SHA-256: 79c3b395fe166b22a4159aeb0598a623dfa047b72064a8f8bb2fedca71a3f442
font_02_sfnt_off00012d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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