Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c8a60ae91beefe…

MALICIOUS

PDF

78.1 KB Created: 2021-05-15 09:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3319b7fb6731130b38045e17cf41b97d SHA-1: 768b9a99954d1954b26a5badb9378f0709257da3 SHA-256: 42c8a60ae91beefe143fd3994088ee613aa584cd64a4e7f72ffaa774b17574bd
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 hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness, specifically flagging it as a phishing trojan. The embedded URLs are likely used to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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/strik?utm_term=what+does+a+engineering+notebook+do PDF link annotation
    • https://nosavarugogitov.weebly.com/uploads/1/3/4/4/134488680/2474f7587.pdfIn PDF document text
    • http://judafipixomet.iblogger.org/diary_of_a_wimpy_kid_wrecking_ball_best_price.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/3460685.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/sekiro_lodig_suzafo.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/bijur.pdfIn PDF document text
    • https://zefipoxiba.weebly.com/uploads/1/3/2/6/132681281/7fcbab.pdfIn PDF document text
    • https://gipoxafevipetim.weebly.com/uploads/1/3/1/3/131398102/dalidukibis_bimija.pdfIn PDF document text
    • https://vubupegizisave.weebly.com/uploads/1/3/5/3/135315261/3090258.pdfIn PDF document text
    • https://puxefulido.weebly.com/uploads/1/3/1/3/131383426/4711806.pdfIn PDF document text
    • https://busozovamifolak.weebly.com/uploads/1/3/4/2/134235369/8593161.pdfIn PDF document text
    • https://romagazep.weebly.com/uploads/1/3/4/7/134759296/54fe71afa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1482387f-61d8-47e1-b538-9b7f1e8b89fb.filesusr.com/ugd/538d67_3f501f6adb0f426bad95baa252445083.pdf?index=trueIn PDF document text
    • http://povovudajax.rf.gd/15967841602.pdfIn PDF document text
    • http://tuxesoguzegisox.epizy.com/navy_seal_training_documentary.pdfIn PDF document text
    • http://wajobodiposad.epizy.com/pomoranivijun.pdfIn PDF document text
    • http://lafibuwed.rf.gd/tikijusepopi.pdfIn PDF document text
    • https://s3.amazonaws.com/tomaxade/damuvapegiragobero.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_382ae28f4cc349f19f710ed4fca5d08e.pdf?index=trueIn PDF document text
    • http://xekibedeba.rf.gd/netbeans_for_jdk_12.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/what_does_212_degrees_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/acc_travel_assistance_form.pdfIn PDF document text
    • http://bividit.rf.gd/92534994273.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/vinipimadudabaxepiguno.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/sasomekaponupovemadodavi.pdfIn PDF document text
    • https://1ae094b9-110d-4377-a83c-911b29edd90d.filesusr.com/ugd/d5eada_4577dfdede4e45c4a711a88fb0858807.pdf?index=trueIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_7aa2ee905b2841be87de3808c1a7c057.pdf?index=trueIn PDF document text
    • http://kobuxotaregudes.rf.gd/semixexuxiver.pdfIn PDF document text
    • https://167c2301-eccc-4e3a-a609-38a4f17b9bf8.filesusr.com/ugd/b1dabf_663ceb8af7534c1e90610ef022ddbe03.pdf?index=trueIn 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_off0000f467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF467 5272 bytes
SHA-256: bad3bf05d27712c2c45ea84e37dc158d20f16c61e865aa4098cfa44ecaee0d3f
font_01_sfnt_off0001065c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065C 10660 bytes
SHA-256: d7cf76bad250e39878f6aa85d76954be3d5c1fb5acef3139d4d0718d182419c6

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