Malicious PDF — malware analysis report

Static analysis result for SHA-256 404e480d25794d76…

MALICIOUS

PDF

79.1 KB Created: 2021-03-01 07:14:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fd06775bd6ac4d5c1cb7d873a40f1e50 SHA-1: b0ba5b63d5dd9372b66e4e17ba54f1cbb24bd334 SHA-256: 404e480d25794d76fe1fff32cdd53e1f398b644bf36a4f26c625eea4166b973b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The presence of a search query in the document body suggests a lure to disguise the malicious nature of the links. The ML classifier and ClamAV detection strongly support the malicious verdict.

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://pelibifir.ru/123?utm_term=why+is+my+hp+4620+printing+blank+pages PDF link annotation
    • https://xowunaxevome.weebly.com/uploads/1/3/4/6/134679103/kilakabu.pdfIn PDF document text
    • https://bunosepe.weebly.com/uploads/1/3/1/3/131379858/jexolajakaxitud-fevuwifetiwi.pdfIn PDF document text
    • https://xuniruki.weebly.com/uploads/1/3/0/7/130739043/6240820.pdfIn PDF document text
    • http://fosibejag.iblogger.org/48671664817.pdfIn PDF document text
    • https://rovepegolotiru.weebly.com/uploads/1/3/4/3/134319415/4659c9.pdfIn PDF document text
    • http://kofojoxake.mygamesonline.org/13643257779.pdfIn PDF document text
    • http://bodyita.space/65940769085scxbz.pdfIn PDF document text
    • http://gufolosolikivu.22web.org/taxabudula.pdfIn PDF document text
    • https://zikemuwebiwolim.weebly.com/uploads/1/3/5/9/135992964/vugonatubofaj.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/zeker-xefijemu.pdfIn PDF document text
    • http://net-klientov.ru/how_to_adjust_a_ryobi_weed_eater_carburetorvyr0k.pdfIn PDF document text
    • https://rawafutaxudux.weebly.com/uploads/1/3/4/0/134041345/nivuma.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
    • http://fozovevozasox.epizy.com/missouri_putative_father_registry_form.pdfIn PDF document text
    • http://jubadoloje.epizy.com/91042568474.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_off0000e94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE94B 5748 bytes
SHA-256: e1dc8ffa11e8eece22eecd4b8c8c161c5681541cea3ca8448865657b6d5cecb5
font_01_sfnt_off0000fcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBF 10620 bytes
SHA-256: cb49c76ead284bcfb5d6621f2dbdc89927c4bf35e56bde6ff5f3b2fc2aa785c0
font_02_sfnt_off000120fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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