Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff8471538a2d6b0…

MALICIOUS

PDF

72.4 KB Created: 2021-02-24 12:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 836d86663fc74d66e1814e07f45104c3 SHA-1: ebea3e76e44676ac8e244e321f6e469051ea0769 SHA-256: cff8471538a2d6b091fa7e147cb47d2a2f936e28ab6e04e7fd5a1ad216d97ae0
136 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains embedded links to suspicious domains, including one that leads to another PDF file, suggesting a multi-stage attack. The document body, though heavily obfuscated, appears to contain product-related text, likely a lure to encourage interaction with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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=shimano+ultegra+r8070+di2+disc+groepset+11+speed
    • http://dhl-order.info/how_do_you_fix_a_black_screen_on_a_hitachi_tvm9l5s.pdf
    • http://azorocheat1.xyz/arcademic_skill_builders_math_gamesyqju4.pdf
    • https://nusepetuvake.weebly.com/uploads/1/3/3/9/133997573/bubivopu.pdf
    • http://vsspb.ru/43185897799gzjdf.pdf
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/poxipiwala.pdf
    • https://xunasumip.weebly.com/uploads/1/3/2/6/132696393/biwegeru.pdf
    • http://magicwoolshop.com/kodiak_bear_hunt_cost1mndo.pdf
    • http://lanejaselisipu.22web.org/33803953438.pdf
    • http://managerprogram.live/guesstimate_questions_and_answersgjb2r.pdf
    • http://natlegend.space/972383799319hzr0.pdf
    • http://wugafis.66ghz.com/avast_antivirus_computer_application.pdf
    • http://ketadiets.site/google_chrome_free_for_ipad_mininpx84.pdf
    • http://braco.ru/25831119874m1u32.pdf
    • https://munipepuxorikoz.weebly.com/uploads/1/3/0/9/130969311/5401718.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://filezigubala.rf.gd/perch_fishing_lake_michigan_reports.pdf
    • https://s3.amazonaws.com/vefagotoje/sisumafozutatugupaka.pdf
    • https://s3.amazonaws.com/jalasilunaz/40099033385.pdf
    • http://tutegijuvejok.epizy.com/how_to_install_graco_snugride_35_base.pdf
    • http://lofenabowebezuk.epizy.com/reinventing_your_life.pdf
    • http://vufagozujidivu.epizy.com/12905852470.pdf
    • https://s3.amazonaws.com/kozibowisenatu/studia_podyplomowe_informatyka_dla_nauczycieli_warszawa.pdf
    • http://muzeduv.rf.gd/whats_the_lug_pattern_on_a_ford_ranger.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_off0000dbf8.bin
c870ecc18db921e430742da119bb301fff1fbf0cc14647a3d2a8efa47f84b06f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 6188 bytes
font_01_sfnt_off0000f0dc.bin
8d89f9bbb83cfe2e37628ab752e8c85c9e14a30686ed95822b37b7fe5458c2af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DC 10272 bytes

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