Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64f0d35b520618c…

MALICIOUS

PDF

94.7 KB Created: 2021-06-09 23:21:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 55ccd42e46548eefe2513a32065e0f47 SHA-1: 69e1964db7768946a0543e62a102950fc0778e4c SHA-256: e64f0d35b520618c7281b98c6d2acef39ae51c94e37fc22cb3c9f7b69cbd246c
186 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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.
  • 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://druttle.ru/123?utm_term=aircrack-+ng+android PDF link annotation
    • https://degegoza.weebly.com/uploads/1/3/0/8/130873855/5811100.pdfIn PDF document text
    • https://zavexirated.weebly.com/uploads/1/3/2/6/132695663/lobegos.pdfIn PDF document text
    • https://dudererojafa.weebly.com/uploads/1/3/4/3/134362298/funukifosukifiwoto.pdfIn PDF document text
    • https://wivikomale.weebly.com/uploads/1/3/2/7/132740486/wedarisufukelut.pdfIn PDF document text
    • https://roxabagoxe.weebly.com/uploads/1/3/1/8/131857818/dffb2aeb1.pdfIn PDF document text
    • https://xizidalubatud.weebly.com/uploads/1/3/4/5/134583516/tejonoj_malafoxabi.pdfIn PDF document text
    • https://nivirijimukavut.weebly.com/uploads/1/3/2/6/132681164/f4db0c16a67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368768/normal_5fe512e7d113d.pdfIn PDF document text
    • https://xutogimumunode.weebly.com/uploads/1/3/4/3/134375265/dujitimonafu.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4393502/normal_60b1c76a18728.pdfIn PDF document text
    • https://pizipeko.weebly.com/uploads/1/3/4/6/134611096/40111df.pdfIn PDF document text
    • https://sujixiku.weebly.com/uploads/1/3/0/7/130739139/maxixod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405195/normal_600269dc6ff88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zigunef.pbworks.com/f/sivok.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/hardware_id_usb_vid_138apid_003drev_0104.pdfIn PDF document text
    • http://ropotupi.pbworks.com/w/file/fetch/144638283/kugonopixizobexabumawo.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/w/file/fetch/144513033/kugakowogirajag.pdfIn PDF document text
    • http://zuxanoguk.pbworks.com/f/xavuzakoni.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144422337/how_to_pass_the_bcba_exam.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144815829/avast_secureline_vpn_android_crack.pdfIn PDF document text
    • http://devopiporo.pbworks.com/w/file/fetch/144982374/50825008523.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013f93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13F93 24628 bytes
SHA-256: aedaf60c12b69cd97df240fda0adb17b56f9b53dfd50bdb98066f2129f8bc557
font_00_sfnt_off0000f21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21E 6460 bytes
SHA-256: 040f7039ae34c611b0d25749c4ec5bbb438fe5bc15215ebb31dcd023ce576fd4
font_01_sfnt_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 4980 bytes
SHA-256: acc8b50d20b0c7a3c87f4f3643c32b25d4ed7c871d8f900a831b808eeb186369
font_02_sfnt_off0001192b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1192B 11308 bytes
SHA-256: 4982b91de2e0f0b68645427c1370591147dadf1315516d0d7f6eb19d3edc48e5