Malicious PDF — malware analysis report

Static analysis result for SHA-256 2843c3b921812726…

MALICIOUS

PDF

82.7 KB Created: 2021-02-19 01:34:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 7f69246130c235dd36e337dee89216b9 SHA-1: 37d28b964159630212a41b95bc7094e173ec0bf5 SHA-256: 2843c3b921812726b0f3f963031cb466e4493021589dc4256abbfb740ed8ce5a
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to PDFs hosted on various domains, including disposable ones. The presence of these links suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the PDF structure itself is indicative of a phishing or SEO spam campaign.

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://seumenha.ru/strik?utm_term=line+6+hx+stomp+alternatives PDF link annotation
    • https://jaketomerinojox.weebly.com/uploads/1/3/4/1/134109184/xaxalobusekib_rogep_dezaduxari.pdfIn PDF document text
    • https://fejurisikem.weebly.com/uploads/1/3/0/7/130740008/zuvexilopotiso-buvilotoberugub-sapog-nawazevivoso.pdfIn PDF document text
    • http://esclub.pro/lubilivipitukifojakijutanu510w.pdfIn PDF document text
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/bagovupufebudalerun.pdfIn PDF document text
    • https://zipiluzus.weebly.com/uploads/1/3/4/2/134234939/5773254.pdfIn PDF document text
    • https://semogabetik.weebly.com/uploads/1/3/1/4/131482882/xikovabaliroxude.pdfIn PDF document text
    • https://nanavefog.weebly.com/uploads/1/3/0/7/130775134/01f466c29067.pdfIn PDF document text
    • https://sowibize.weebly.com/uploads/1/3/5/3/135348762/pexugexezoru.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/4450728.pdfIn PDF document text
    • https://nererudufujodu.weebly.com/uploads/1/3/4/3/134321338/97f384593465a.pdfIn PDF document text
    • https://kaxaxelakag.weebly.com/uploads/1/3/4/2/134235500/c89d0193284.pdfIn PDF document text
    • http://hookup153.fun/r_programming_full_tutorial_free_downloadsxtpd.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/powob_wajesuzex.pdfIn PDF document text
    • http://arbitestpark.xyz/82727807739vr8e1.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B2 5284 bytes
SHA-256: 8373d373eec649250a17664dae57367eacfbc7f4f8326bd98c73122ceb8723c0
font_01_sfnt_off00011784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 11900 bytes
SHA-256: 1f933b06d18755f0ebff2973510d8677b695eabfb421a1b471e8bf4f2e86b79a

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