Malicious PDF — malware analysis report

Static analysis result for SHA-256 e01f908457fc5340…

MALICIOUS

PDF

71.3 KB Created: 2021-04-03 18:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d29a26940fd48421f82af9ee46a6331d SHA-1: eda028a4adfc4bb810a5df622ead9bfb4a947ed0 SHA-256: e01f908457fc5340344e89dc670a9487a231fa3b79b59472d5d215aec8bde389
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many of which are obfuscated or use numeric slugs, suggesting a link farm or SEO poisoning tactic to direct users to potentially malicious content. The primary URL appears to be a lure related to academic answer keys, a common phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://botokaw.ru/wix?keyword=mcgraw+hill+connect+answer+key+macroeconomics
    • https://cdn.sqhk.co/vakanaju/hNhjc76/26383493136.pdf
    • https://cdn.sqhk.co/feripamapuv/Z4jBja9/horror_movies_to_watch_on_netflix_with_friends.pdf
    • http://lenuvivureropi.scienceontheweb.net/zavofawipaloxigipebulusen.pdf
    • https://cdn.sqhk.co/tifobebe/mJjdfmI/roblox_toys_walmart_usa.pdf
    • http://tikixoji.mywebcommunity.org/introduction_to_differential_topology.pdf
    • http://idealslimitalia-official.site/409146831915bgmh.pdf
    • https://bosamekuxukis.weebly.com/uploads/1/3/4/6/134672370/de9057641275.pdf
    • https://cdn.sqhk.co/bolukawet/jdjiqjj/between_the_sheets_mangapark.pdf
    • https://cdn.sqhk.co/lopumilekana/cvPgewP/99484661837.pdf
    • http://hushseo.online/world_history_book_freekgdz9.pdf
    • https://cdn.sqhk.co/kebabefepu/eSShc11/new_york_city_night_day_protests_last.pdf
    • https://napokepuwaju.weebly.com/uploads/1/3/1/1/131164128/kixunutebitodumos.pdf
    • http://letgtma.bid/45767619679rl9k9.pdf
    • http://crawlmqyu.space/mulajedugutawituvegexocibyk.pdf
    • https://zonanasuwovu.weebly.com/uploads/1/3/2/6/132683154/9a3dd320b.pdf
    • http://vostokzapad.su/probability_and_statistical_inference5ab6e.pdf
    • http://dusejetiwogodad.getenjoyment.net/zatowevasikaviwomiwapox.pdf
    • https://jitipukojid.weebly.com/uploads/1/3/4/7/134707402/1458833fa815448.pdf
    • https://cdn.sqhk.co/xupebasolaw/gejfiqn/saforojif.pdf
    • https://zopojezumaze.weebly.com/uploads/1/3/1/6/131637354/vogelelobin-sulagixidarovu.pdf
    • https://cdn.sqhk.co/vilubofi/dididif/5809153270.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d571.bin
fdb4e6ca16b0d4a6163fb7b7cfdf5d64dba0d516f16d452ad2a4313f744da1cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 5476 bytes
font_01_sfnt_off0000e810.bin
e201168a291bb53411e88a197ebc1efb79f2d6968cdd43e49bd03c50bc8f933c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE810 11532 bytes

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