Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e2e153cbfbd1347…

MALICIOUS

PDF

70.4 KB Created: 2021-02-11 17:25:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 7989de50d676bd4c5c5c44f96c48d118 SHA-1: b06b32c819e186509fa5f8c9490dab3e3c3af6b7 SHA-256: 3e2e153cbfbd13475d9ec9884d157c90d1a02f27ecfccb2c83db9dac38644655
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The primary URL, https://baarspo.ru/wix?keyword=britax+booster+pioneer+vs+frontier, indicates a lure related to product comparisons. No scripts were extracted, but the PDF structure itself facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wix?keyword=britax+booster+pioneer+vs+frontier PDF link annotation
    • https://zademufexek.weebly.com/uploads/1/3/4/7/134765537/kideferitisaf_nawujizigitov_tidij_gugeji.pdfIn PDF document text
    • https://lidafeli.weebly.com/uploads/1/3/4/6/134683499/fupexunemijalanopal.pdfIn PDF document text
    • http://itwomen.space/93147843897x8h07.pdfIn PDF document text
    • https://zokofefedepop.weebly.com/uploads/1/3/1/4/131437243/3c320cbf7d2c.pdfIn PDF document text
    • https://dujizajep.weebly.com/uploads/1/3/4/7/134704211/deroxatij_bilujesuwokesil.pdfIn PDF document text
    • https://werotibumef.weebly.com/uploads/1/3/4/9/134900185/mupilokuxupebidi.pdfIn PDF document text
    • https://zoperugojoboriv.weebly.com/uploads/1/3/1/3/131379643/4653895.pdfIn PDF document text
    • https://tixanesel.weebly.com/uploads/1/3/4/2/134234664/64409.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/i4ugehd/tirafas.pdfIn PDF document text
    • https://kajipeluvo.weebly.com/uploads/1/3/4/3/134318391/jixobuzamubiwekif.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/i0ihWTl/bevupixuligij.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/31jeHOl/kudabodomiwegusi.pdfIn PDF document text
    • https://cdn.sqhk.co/kinemefuwa/jehiOhg/dabigawojizevun.pdfIn PDF document text
    • https://vizodifoberesin.weebly.com/uploads/1/3/4/9/134900429/putomagapanaso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ditiruz/penusipinixoxidavemisaj.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/82741871855.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_off0000d7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DB 5180 bytes
SHA-256: 6721cf33e1a1488d762dfe73feedcd519286a2fa5df2fd46c988b2ca75ecd70c
font_01_sfnt_off0000e990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE990 10208 bytes
SHA-256: 6f407a9e3d2363cb4cf714fc700ce209545be867c45a3d00eac6d7a5fda36fb7

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