Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5156511859c89af…

MALICIOUS

PDF

69.3 KB Created: 2021-06-11 17:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 375b806427f33015d35798f16d37bdd7 SHA-1: 69a376d00d31d111b2768f12182c7fd2fdd566a2 SHA-256: c5156511859c89af065ae433e8863d3f9b45b538dc6d7542bdcbe2aaa9c4e8f3
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure strongly suggest an attempt to exploit users through deceptive links, likely as part of a phishing campaign or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://cructi.ru/pbw?utm_term=rowley+jefferson%2527s+awesome+friendly+adventure+pdf+free
    • https://jadusozig.weebly.com/uploads/1/3/5/3/135327359/xolozamulebixozomivo.pdf
    • https://dapijapivabug.weebly.com/uploads/1/3/4/3/134338952/lezisebijazemibifip.pdf
    • https://static.s123-cdn-static.com/uploads/4405907/normal_6005acb0935de.pdf
    • https://kawawipebezuvo.weebly.com/uploads/1/3/1/4/131409621/5370787.pdf
    • https://banalixigadevub.weebly.com/uploads/1/3/4/7/134722660/6410725.pdf
    • https://vebavorosufate.weebly.com/uploads/1/3/4/7/134742301/90312c.pdf
    • https://static.s123-cdn-static.com/uploads/4366407/normal_5ff7660ea36e0.pdf
    • https://wimitefadekox.weebly.com/uploads/1/3/4/5/134586198/4177858.pdf
    • https://woteginawewe.weebly.com/uploads/1/3/1/3/131379999/nikozovow.pdf
    • https://cdn-cms.f-static.net/uploads/4388293/normal_606ae9eae0cbb.pdf
    • https://liruviwogaralo.weebly.com/uploads/1/3/0/7/130776788/5524328.pdf
    • https://jevilurusev.weebly.com/uploads/1/3/4/7/134749577/gededudewudixezubup.pdf
    • https://cdn-cms.f-static.net/uploads/4379961/normal_604caf2ea6c4d.pdf
    • https://vebibuwiruzubos.weebly.com/uploads/1/3/4/3/134307756/jasibulotojumab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mudowomuxexo.pbworks.com/w/file/fetch/144422592/am_pm_ka_full_form_kya_hoga.pdf
    • https://uploads.strikinglycdn.com/files/5c0e51f1-8d91-4b2b-a721-4987b350fb4c/nedifon.pdf
    • http://kibumezi.pbworks.com/f/tanu_weds_manu_returns_mp3_song_download_bestwap.pdf
    • http://nebapelamive.pbworks.com/f/xaxowusuxonulejetulav.pdf
    • https://uploads.strikinglycdn.com/files/49b673da-49b5-4982-8c65-072f280cfa95/77317729631.pdf
    • https://uploads.strikinglycdn.com/files/24e1170a-bd81-44b7-a80c-4e3e49eafc10/nanodrop_one_price.pdf
    • http://gijorugisaw.pbworks.com/w/file/fetch/144501039/sijosolexomigad.pdf
    • https://uploads.strikinglycdn.com/files/37c48d6a-dadf-4169-8ee5-01cb63e8661c/32284789203.pdf
    • http://nerobedevu.pbworks.com/f/dheere_dheere_bol_koi_remix_mp3_song_download.pdf
    • https://uploads.strikinglycdn.com/files/bba8e05a-e232-4e1d-bed2-714596d0f2ec/last_of_the_mohicans_theme_song.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_off0000cea7.bin
1703ffd3d82dc36e47c4b6284e63582d55621e887f7fd263cd1e607bf002d5a1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA7 5556 bytes
font_01_sfnt_off0000e1ad.bin
105c2012aa6e9a984e2bcdcb3172ca0b705ef14cac824f41a0859df40ed68f60
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 11048 bytes