Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38d4b2254347f25…

MALICIOUS

PDF

74.2 KB Created: 2021-03-27 22:24:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32563f69b050aa598cbac2321226f2d6 SHA-1: db03577906dbbe61205dca6f656cb7682a3e26ed SHA-256: d38d4b2254347f259275d4c147d90f2b78ad25641ecbaffd563c672fd94f5724
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for SEO manipulation or distributing malware. Heuristics indicate a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=you+are+my+sun+my+moon+and+all+my+stars+full+poem
    • https://diwejixa.weebly.com/uploads/1/3/4/6/134629966/04b8c1d.pdf
    • https://bugibupezo.weebly.com/uploads/1/3/4/7/134711935/3081744.pdf
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/niluga.pdf
    • http://riwozizedilar.mygamesonline.org/cara_convert_ke_word_via_android.pdf
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/daxefumetunujis-delowipufadezir.pdf
    • https://zuzotupewumu.weebly.com/uploads/1/3/4/6/134691050/nuxiwuroranob.pdf
    • https://jufoximivovanad.weebly.com/uploads/1/3/4/0/134013024/9613135.pdf
    • https://seruvukajobal.weebly.com/uploads/1/3/4/4/134479042/zorogasa.pdf
    • https://nizodori.weebly.com/uploads/1/3/4/0/134000204/f5eab9d70138202.pdf
    • https://wabiwuwisurukim.weebly.com/uploads/1/3/2/6/132682822/vudimowej-xemajezuga-nedutigeke-suxerasofag.pdf
    • http://fetoxuk.mywebcommunity.org/13445569072.pdf
    • https://fozirufimagez.weebly.com/uploads/1/3/0/9/130969558/2092153.pdf
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/sapozarizatajoti.pdf
    • https://japapitamamevoj.weebly.com/uploads/1/3/2/7/132740309/nirujo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nujuxat.epizy.com/21001760353.pdf
    • https://s3.amazonaws.com/nefunupu/bixby_2._0_apk.pdf
    • http://nojikigor.myartsonline.com/volume_of_3d_shapes.pdf
    • http://duvexarido.epizy.com/40239148478.pdf
    • http://rarifope.rf.gd/wipugogonadevexotex.pdf
    • https://s3.amazonaws.com/donarepemi/bugojibanibewipafuzog.pdf
    • http://gijurivotisu.epizy.com/how_do_you_convert_fractions_to_decimals_on_a_casio_calculator.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_off0000e2fb.bin
100de9c33a6ce57e9813e72a59c662cd6a31d7d0bd30891965cc33c1bd26b0f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 5248 bytes
font_01_sfnt_off0000f4cb.bin
58b80a6ba49272bdb0e413ec8f39ee298bef6e9794b6d08c2a1b40e998bac3ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CB 10600 bytes

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