Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecc88da9c70f70e6…

MALICIOUS

PDF

65.5 KB Created: 2021-02-09 00:13:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6b456308080d519322cf660a14d221d0 SHA-1: 05c67af66c1b71a04e162e97d3de8af083fe3dd9 SHA-256: ecc88da9c70f70e6f86397e3b5aa4597ee69e4a465382328d3c5651f0d7c0a49
304 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting and redirectors, indicating a link farm designed for malicious purposes. The heuristic 'SE_BRAND_CREDENTIAL_PHISH' specifically identifies a Facebook brand impersonation lure pointing to an abused redirector, strongly suggesting a phishing attempt. The presence of embedded URLs and the ML classifier's high confidence score further support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/849c6dd493f.pdf.
  • 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.
  • 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://yafferge.ru/aws?utm_term=harlem+renaissance+poetry+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465402/normal_5fdadc2b17e78.pdfIn PDF document text
    • http://in-step.shop/xulonimuge7630.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453909/normal_60052d7a1006e.pdfIn PDF document text
    • https://cdn.sqhk.co/xonepogafix/hgdijjc/thomas_and_friends_magical_tracks_unlock_everything.pdfIn PDF document text
    • https://jodisugej.weebly.com/uploads/1/3/4/7/134732418/849c6dd493f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461216/normal_5fd233d68946f.pdfIn PDF document text
    • http://nuxuxavolas.22web.org/caller_id_blocker_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/jbbH2PB/vizakafafefurevunojuka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415046/normal_601a876a58bfd.pdfIn PDF document text
    • https://pedodexojur.weebly.com/uploads/1/3/0/7/130775447/mafasu.pdfIn PDF document text
    • https://cdn.sqhk.co/dimowitop/jgjhAie/xidaguxolutopijafepusu.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/75454828074imufr.pdfIn PDF document text
    • http://walletelectrum.buzz/game_dead_by_daylight_mod_apkny1es.pdfIn PDF document text
    • http://modernstyle.pro/Teppen_Ramen_East_55th_Street_New_York_NY4y9j6.pdfIn PDF document text
    • https://cdn.sqhk.co/bevoletef/ggilUjg/pixel_battleground_offline_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/SjgiiR4/84418452024.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC440 5392 bytes
SHA-256: cf3114c30648bb5c24a64c538c8e916187f1c268b165238174bc29dc6656c27f
font_01_sfnt_off0000d67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67F 10124 bytes
SHA-256: 95e4cb03acb90f0cf5dc073351a4429dfbad680cc3ea6204a7ce7e65c85ce073