Malicious PDF — malware analysis report

Static analysis result for SHA-256 90809bba4ef5d0c4…

MALICIOUS

PDF

78.7 KB Created: 2021-04-04 00:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 44344706f014b91cc5e52b68eb26a712 SHA-1: 1c1de00312cc7de29998ae468b4425b2cdea48ea SHA-256: 90809bba4ef5d0c4e584dac14c6d1a71e2689c897b89e240beee0e74a2733c5b
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a phishing or link-farming operation. The presence of embedded URLs and the PDF structure point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=are+the+words+mom+and+dad+capitalized PDF link annotation
    • https://cdn.sqhk.co/milatepoz/ggGhaid/science_journalism_courses_online.pdfIn PDF document text
    • http://barbanapoli.moscow/blitz_brigade_gameplay_androidueyr3.pdfIn PDF document text
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/1696100.pdfIn PDF document text
    • https://ruzamugube.weebly.com/uploads/1/3/4/0/134040566/juvaxinidanawokuwubi.pdfIn PDF document text
    • https://cdn.sqhk.co/soletibedix/bB43igK/gotabixisajawev.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/zjgi0hc/mamizadiwoxafuzezawageto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_60426f5a8b756.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368245/normal_5fdfc30a1ab52.pdfIn PDF document text
    • http://afracheat5.xyz/pokemon_hyper_emerald_rom_free_downloadhqykl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388424/normal_60603c48b03f8.pdfIn PDF document text
    • https://cdn.sqhk.co/lenubire/jfii6if/68441020607.pdfIn PDF document text
    • http://mandarin-fruit.space/73757886474puyax.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/OFxhdZk/figiza.pdfIn PDF document text
    • http://olx-delivery.cc/fizaku1nvmi.pdfIn PDF document text
    • http://gatorama.fun/36143287040gkrcy.pdfIn PDF document text
    • http://epaytds.xyz/android_pay_and_apple_pay9kqrc.pdfIn PDF document text
    • https://dosoludu.weebly.com/uploads/1/3/0/8/130814101/dekadalukobor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444623/normal_6060f1125f48d.pdfIn PDF document text
    • http://tujidal.mypressonline.com/63996733200.pdfIn PDF document text
    • http://idclick.cash/50997183298goez.pdfIn PDF document text
    • http://svoytrylend.xyz/hitman_blood_money_guidems4m4.pdfIn PDF document text
    • http://losqutoq.online/41639943785pc1j9.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/ap_module_grade_10_3rd_quarter.pdfIn PDF document text
    • https://bowotile.weebly.com/uploads/1/3/4/7/134759747/memukatiw-mefodi-wesenaxag-todojotojo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sewujajapivix.onlinewebshop.net/good_better_best_strategy_examples.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_off0000f454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF454 5444 bytes
SHA-256: 9ebfdb1e924f63f17f588dd9cf31af0634eaf6462cc553ae4d90a74f0253ae01
font_01_sfnt_off000106c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C6 11188 bytes
SHA-256: 2abb437df51f72b7848fd7e45a089e473507f52f931ef0cb976634a23b0a392e

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