Malicious PDF — malware analysis report

Static analysis result for SHA-256 a164e5f4067d2e1f…

MALICIOUS

PDF

78.9 KB Created: 2021-02-15 18:20:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bad69bd7e8526e40ce7ffddab648154c SHA-1: 1a22ba0d4b03349676679eea163384d709c01b9d SHA-256: a164e5f4067d2e1fea6b9c0855908df626351f5341c161932692d81eb84911a4
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to disposable domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The presence of embedded URLs and the overall structure strongly indicate a phishing or spamming campaign, likely delivered as a spearphishing attachment.

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/123?utm_term=best+starter+class+eso+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459469/normal_5fe32e3448604.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/hjLkNia/gezefafutujikoburamodumaw.pdfIn PDF document text
    • https://nububoreral.weebly.com/uploads/1/3/4/4/134467099/6480174967d.pdfIn PDF document text
    • https://jafakatulo.weebly.com/uploads/1/3/4/3/134353771/visavup-vumufezinejowuf.pdfIn PDF document text
    • https://rilewinip.weebly.com/uploads/1/3/5/9/135964764/9268326.pdfIn PDF document text
    • https://dazarurizupe.weebly.com/uploads/1/3/1/1/131164120/6242394.pdfIn PDF document text
    • https://xowitato.weebly.com/uploads/1/3/0/7/130776358/tomuzetalexi_gijosafirileruv.pdfIn PDF document text
    • https://cdn.sqhk.co/gubogezemazo/u5jchgf/rukekulularafidagipa.pdfIn PDF document text
    • https://cdn.sqhk.co/jidulopavoji/nOtiajd/48918350142.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/ihbjeib/basketball_training_equipment_australia.pdfIn PDF document text
    • https://nimafomu.weebly.com/uploads/1/3/2/7/132710507/duvoriwez_gewapived.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_601ba815e85c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385217/normal_5fcb9eafc4ee8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pepajefosub.epizy.com/nititozevugofewenupub.pdfIn PDF document text
    • https://s3.amazonaws.com/bomifabipi/lifibokosusofonumovoku.pdfIn PDF document text
    • http://tanijug.rf.gd/72756847183.pdfIn PDF document text
    • http://rigitusavogu.epizy.com/vuwurure.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_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 5116 bytes
SHA-256: a26c014aaa9b937132c51e1b6d3151a0cc8e7fdeb38a3ad33b188a8c340eccac
font_01_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 10956 bytes
SHA-256: da3f3a0c0d94273763e49c717926f58065daf3ce07e6d53c0d01f6154bdb25e7

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