Malicious PDF — malware analysis report

Static analysis result for SHA-256 3750a9b8038aab9f…

MALICIOUS

PDF

85.6 KB Created: 2021-02-20 04:14:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 38fdbc7cf87d49a15547b47b4d0b5806 SHA-1: e9a8f542fb30d4c440aee92b2c5f0ff68798da8e SHA-256: 3750a9b8038aab9f78df501d5ee72548b369305458a4c0ca231d5ca55a4c2e9c
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crophysi.ru/wix?keyword=zoosk+hacked+apk PDF link annotation
    • https://zudovizu.weebly.com/uploads/1/3/4/3/134338339/859570.pdfIn PDF document text
    • http://kikebumanexewuj.22web.org/93697150259.pdfIn PDF document text
    • https://mezobemubuzopos.weebly.com/uploads/1/3/3/9/133997151/5188171.pdfIn PDF document text
    • https://sodukosikel.weebly.com/uploads/1/3/4/5/134598711/vowage-bupotu.pdfIn PDF document text
    • https://bilagezapa.weebly.com/uploads/1/3/1/1/131163658/totidube_kewafiz_lerar.pdfIn PDF document text
    • https://cdn.sqhk.co/pugipepa/3gh6gdM/zerakor.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/hjgcTFV/69669040461.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/fibjgx7/59431100240.pdfIn PDF document text
    • https://xagapetudiza.weebly.com/uploads/1/3/4/6/134686513/marujubotozapivoj.pdfIn PDF document text
    • https://cdn.sqhk.co/mozoposowi/jIghicP/oregon_fire_evacuation_map_oregon._gov.pdfIn PDF document text
    • https://jabukosiw.weebly.com/uploads/1/3/0/8/130874379/8711455.pdfIn PDF document text
    • http://tozepefaj.iblogger.org/20678074737.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/ihHghgi/kezuvuguxojotazunibevu.pdfIn PDF document text
    • https://bukivobiwizu.weebly.com/uploads/1/3/4/0/134097020/wewepeful_nimagofufejo.pdfIn PDF document text
    • https://zuvofuguwapu.weebly.com/uploads/1/3/4/0/134042474/porotevu-varelo-noxolotapoki.pdfIn PDF document text
    • http://virilibag.66ghz.com/battlefield_1_for_pc_windows_7.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/jhcjfji/30861510497.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://musowafotoxipid.epizy.com/89493529074.pdfIn PDF document text
    • http://dipobitabi.rf.gd/web_browser_for_android_2._1.pdfIn PDF document text
    • http://misukejijixuke.epizy.com/tuzover.pdfIn PDF document text
    • http://nesitobika.rf.gd/8528129542.pdfIn PDF document text
    • http://sirilamezowi.epizy.com/coastal_erosion_worksheet_ks2.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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE69A 4608 bytes
SHA-256: 655ae7b6991e6971b4d745be3a1b2a722d57d0606b9ce3a36f4d63602e80ad61
font_01_sfnt_off0000f63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63F 1944 bytes
SHA-256: 4a7a17ef0ba0b87d3101fb253220c21ebf70d31c9b38729fcc60725578a726a3
font_02_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 10900 bytes
SHA-256: 6bebdf6f3cf4eea9e3bf81d9689c17db40a230ed7ab09d2cccaba2c63b61493b
font_03_sfnt_off00012516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12516 16168 bytes
SHA-256: bcfecb9fde4b74e4a2b692e15caf305b2988a1cfe4c6386614002e38d35feb86
font_04_sfnt_off00013a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1C 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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