Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89e43150c534fe2…

MALICIOUS

PDF

97.1 KB Created: 2021-03-15 22:33:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bd92f79ffb0d65150c7660bbc6ef1fc SHA-1: d3fa2a48cd4d8cace04d5bae23978ad078dd0cf8 SHA-256: b89e43150c534fe2178e72beebcbb4b1797611ed2e873b384be66d7de0516d2b
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=native+american+zodiac+wolf+meaning
    • http://detobusukited.iblogger.org/free_autocad_2013_xforce_keygen_x64.pdf
    • https://kabuxezalexafa.weebly.com/uploads/1/3/0/8/130814122/nerifumu.pdf
    • http://buxuzexutotuf.22web.org/fukijikom.pdf
    • https://narapafugoziror.weebly.com/uploads/1/3/0/7/130775848/9cf2b1.pdf
    • http://lufirisor.iblogger.org/gobekuwupax.pdf
    • https://kezaguwubov.weebly.com/uploads/1/3/4/6/134632481/efa7f83.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_8eb6b8ebbb574502b526d11f10e048e0.pdf?index=true
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_9c40bed8774c420fa09e2b4f0ef9bf6a.pdf?index=true
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_a4b9bd624b2640058509dc4acba5b99a.pdf?index=true
    • https://7aff118d-26f6-4d76-9bc9-1838009e7274.filesusr.com/ugd/f80014_e7a9b23c77734ebf83d16a6b19d9a93a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/da639735-c4b2-4e2d-8d5e-3aa5670bcdae/painting_with_a_twist_orlando.pdf
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_37dad17d431e46b68c5808973d906f9c.pdf?index=true
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_b7777941329941b7a0ee9b1d33261aac.pdf?index=true
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_9b30eb73e8fa4881be367fc95d1ce34c.pdf?index=true
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_17c6b904cf1b44cb988a79b4eaae9ffd.pdf?index=true
    • http://lukugebov.rf.gd/88613197564.pdf
    • https://uploads.strikinglycdn.com/files/05f09844-8098-416a-9ba1-3c80006cb657/67038137241.pdf
    • http://jejomozukiro.rf.gd/how_to_day_trade_in_stocks.pdf
    • http://zixedofa.epizy.com/binomial_theorem_notes_for_iit_jee.pdf
    • http://koroxep.rf.gd/jupiter_japan_income_fund_fact_sheet.pdf
    • http://pejonoma.epizy.com/what_to_do_if_my_smart_tv_wont_connect_to_the_internet.pdf
    • http://zoxelapotojawub.rf.gd/sodozis.pdf
    • https://2ed821ec-8078-4e74-b11b-c5cec6a88262.filesusr.com/ugd/65e777_02915a2ef3a7428aa194b00a6cd46ecb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c12be0b6-5d1e-4684-aa31-a6fff0f84d2c/how_long_do_viking_ovens_last.pdf
    • http://lejujafaroxe.rf.gd/loroporetuworazeluzewuri.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001239e.bin
6d4a80c825d81803592afd2d89bdacfbf300f1fecd15b2705b8d223b3d05b235
pdf-font-stream PDF embedded font (sfnt) at offset 0x1239E 5332 bytes
font_01_sfnt_off000135d5.bin
0fb9672512b3ce3594b79d94dfa223b61e9e869466f31eb3f0a26399f94c76d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x135D5 10668 bytes
font_02_sfnt_off00015a15.bin
e3c999ecec4503231f0737995effe8c8dc030dcf48922e2e22cc9d7a9d3733fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A15 18340 bytes