Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc21d95ee4935c1…

MALICIOUS

PDF

130.3 KB Created: 2021-04-05 09:44:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1fe23761c7640460b3d7e18ec1c4169 SHA-1: b4680ae061fd5a7ebf5b1bd51876200e1738ce7c SHA-256: cdc21d95ee4935c1dce878dc61c0858d4f19dd62d828c7168a257a36012851a1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or hosting malicious content. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/strik?utm_term=how+to+make+a+mist+maker+machine
    • http://smartcreditcheck.info/what_do_illinois_state_taxes_pay_for0h6hs.pdf
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/komog.pdf
    • https://xubivolimoba.weebly.com/uploads/1/3/0/7/130740090/b2a81b5517608.pdf
    • https://cdn-cms.f-static.net/uploads/4417205/normal_603434cfd49fb.pdf
    • https://doxizuzipoleri.weebly.com/uploads/1/3/5/3/135323895/todotuwofowogobixobe.pdf
    • https://cdn-cms.f-static.net/uploads/4390373/normal_605c774dc5a92.pdf
    • http://aydym.club/axiom_pro_61_hypercontrol_driverprut0.pdf
    • https://static.s123-cdn-static.com/uploads/4390381/normal_5fc8e90d8199a.pdf
    • https://cdn-cms.f-static.net/uploads/4409811/normal_602be25a4a9f2.pdf
    • https://leguwilevifemat.weebly.com/uploads/1/3/4/5/134595517/fovujigem.pdf
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/7940909.pdf
    • http://alcexpress1.xyz/fuxupoximo7zno.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cbe786a7-4564-4882-b808-e736f243f43b/vodesovinov.pdf
    • https://s3.amazonaws.com/bulikowexunepov/26180500855.pdf
    • https://s3.amazonaws.com/tuzakifezara/sebej.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/62748339580.pdf
    • https://uploads.strikinglycdn.com/files/a30831e5-2969-4788-8873-9cd765d2146b/mewifaboxufarodox.pdf
    • https://s3.amazonaws.com/dazovosugev/east_taylor_township.pdf
    • https://uploads.strikinglycdn.com/files/ad87d92b-22fb-4863-b9b2-98df9a69839c/fefizopegupigafebozat.pdf
    • https://s3.amazonaws.com/sagotomagin/7226210589.pdf
    • https://uploads.strikinglycdn.com/files/75e679e8-3140-470f-a050-45646d1ce4c7/92.1_the_wave_radio_station_hawaii.pdf
    • https://uploads.strikinglycdn.com/files/f7b6a660-e53c-4ce7-bed5-6715636b1c88/monevebezopasumajo.pdf
    • https://uploads.strikinglycdn.com/files/4806b655-9a43-4766-8cb8-9f4bace9b961/13236008643.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_off0001c27f.bin
8dc179532c24fdd3f342888ce08b953a7cdf188a110b60544458ea66893674ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1C27F 5124 bytes
font_01_sfnt_off0001d3cc.bin
a03baaac71ddfa2a0fea93e5adc81f05605a9092658c238a0efcf9a13e618ce8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3CC 12048 bytes