Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9aeec1c2c25e0d2…

MALICIOUS

PDF

72.7 KB Created: 2021-05-31 19:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 769f5e51236976ecca42e5f0b3182d3a SHA-1: 2b36d88e1ab6eb8063596fb9cd1bc732e752281d SHA-256: c9aeec1c2c25e0d29a85716f336c2c4174d64cbd956290c500ecab5f3079bd97
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicating a potential link farm or phishing attempt. The heuristic 'PDF_SEO_LINK_FARM' strongly suggests this, and the presence of an embedded URI further supports this. While no scripts were extracted, the overall structure and the number of outbound links point towards malicious intent, likely for SEO spam or to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/pbw?utm_term=how+long+is+the+osha+10+test
    • https://gigiwejube.weebly.com/uploads/1/3/5/9/135984489/gufesezarukatu.pdf
    • https://wexegupewafux.weebly.com/uploads/1/3/4/4/134443826/1238417.pdf
    • https://sinuvofibudibaf.weebly.com/uploads/1/3/2/6/132696377/a2ebfb80c7ad50.pdf
    • https://kusudojisopev.weebly.com/uploads/1/3/4/7/134774064/437097055f05ae8.pdf
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/jagolesudusemug-vewogalesa.pdf
    • https://static.s123-cdn-static.com/uploads/4451756/normal_5fff5fa9864bc.pdf
    • https://fopilifufisi.weebly.com/uploads/1/3/6/0/136055159/sidamubo_xizulotum.pdf
    • https://betiriwusogaz.weebly.com/uploads/1/3/1/3/131380032/72ef6e9b2.pdf
    • https://cdn-cms.f-static.net/uploads/4464052/normal_604502aec7744.pdf
    • https://fujelaxu.weebly.com/uploads/1/3/4/7/134704358/6709958.pdf
    • https://cdn-cms.f-static.net/uploads/4388169/normal_605b8d8921383.pdf
    • https://rolawopu.weebly.com/uploads/1/3/4/3/134317168/kanit.pdf
    • https://jujamepusa.weebly.com/uploads/1/3/2/8/132815903/18e09e76fe11.pdf
    • https://jebovemedafo.weebly.com/uploads/1/3/0/8/130813903/tuvabakazipoj.pdf
    • https://tunegize.weebly.com/uploads/1/3/4/5/134500295/xasizowuxojobis-vuvunope-xezore.pdf
    • https://cdn-cms.f-static.net/uploads/4409256/normal_6064a2d706590.pdf
    • https://kemudebudejel.weebly.com/uploads/1/3/4/7/134718551/706633.pdf
    • https://kagixopobexumel.weebly.com/uploads/1/3/4/6/134648921/47265f14.pdf
    • https://gizizajavime.weebly.com/uploads/1/3/2/6/132695742/2216393.pdf
    • https://doxevojipodozij.weebly.com/uploads/1/3/0/7/130775942/33a90347.pdf
    • https://rexaririwe.weebly.com/uploads/1/3/1/6/131637114/f4b2a1b03e3146.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xedidovetaw.pbworks.com/w/file/fetch/144414780/61052294162.pdf
    • http://zepadatoju.pbworks.com/f/copper_wire_standard_wire_gauge_chart.pdf
    • http://lakebimutep.pbworks.com/w/file/fetch/144415905/90599145744.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd70.bin
619f06de1c5b51f6ec56047379d2071a19cb367e995fc0cf5c9c93c70d815dc0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 5100 bytes
font_01_sfnt_off0000eee3.bin
609c34c01157beb9697f3b64db297b1c2da09f803cdab93c95823e508d816ac5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE3 11336 bytes

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