Malicious PDF — malware analysis report

Static analysis result for SHA-256 9281b07eb9249cbb…

MALICIOUS

PDF

73.6 KB Created: 2021-03-14 05:44:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 83031d097fbb503c9b74f6ed43a80ded SHA-1: 2524fdb97ae249a81f4bf57030f41d5066fcb591 SHA-256: 9281b07eb9249cbbb73fb80d70008c773276de1c7b26f297c3246db3e2311c95
86 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) 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 0.9998

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/strik?utm_term=how+to+program+a+woods+50008+timer PDF link annotation
    • http://kulotufiw.mypressonline.com/xusizixi.pdfIn PDF document text
    • https://cdn.sqhk.co/kedezoge/chbiDid/vatorebetadamexizusor.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/apc_smart-ups_c_1500va_lcd_ups_-_900w_-_1500va_smc1500.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/duchess_of_malfi_as_a_revenge_tragedy.pdfIn PDF document text
    • http://xufededubumavif.scienceontheweb.net/posirerozikiworila.pdfIn PDF document text
    • https://pugotaba.weebly.com/uploads/1/3/5/3/135302821/xiludexul_mewifib_sevejumepimuk_jarowuzuvifu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445889/normal_5fef5f17c498a.pdfIn PDF document text
    • http://retys.fun/how_to_do_a_hard_reset_on_microwavegr2zh.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/what_to_read_after_red_rising_trilogy.pdfIn PDF document text
    • http://muwiduvepobuz.mygamesonline.org/10929328902.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/consumer_buying_behavior_project.pdfIn PDF document text
    • http://nadahul.ru/all_souls_catholic_church1u1pa.pdfIn PDF document text
    • http://gofadivus.mygamesonline.org/80780558105.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407562/normal_601876cdeaf6b.pdfIn PDF document text
    • https://kutufexefe.weebly.com/uploads/1/3/4/6/134695169/wotojexogob-dimako-gaxulupivelipa-wiwaweri.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/ohcxieZ/movies_2020_out_now.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474734/normal_600120b3426c8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisunopesaluzi.atwebpages.com/40909299970.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D0 5760 bytes
SHA-256: d9de3abee8352171934a72cb90f6ccd16a6578e6c41e60762fe8ef74c52fb507
font_01_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 10680 bytes
SHA-256: 4d1eb1ca1dfbe9d6b746b61261cdb0ea6bbbd8a001c476c52e5a87e26ce88de3