Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6d75c0805f9c7c…

MALICIOUS

PDF

82.3 KB Created: 2021-06-10 03:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: c2754973230e310cb5de95c08337a068 SHA-1: ddcedd03ac85d123d98016d81a40cbd4a15e7fd3 SHA-256: 6f6d75c0805f9c7c329e697fbeb3a4e7662ec39266903b4240ffb32550ca1522
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The primary URL, https://golowaki.ru/123?utm_term=gold+coast+to+brisbane+traffic+report, is likely part of this scheme. No scripts were extracted, but the PDF structure and numerous external links are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=gold+coast+to+brisbane+traffic+report PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501501/normal_600dbd039b215.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384640/normal_5fd9a229dab96.pdfIn PDF document text
    • https://pilazelade.weebly.com/uploads/1/3/5/3/135397465/006aa2049.pdfIn PDF document text
    • https://fevebelok.weebly.com/uploads/1/3/4/0/134012800/zevazezefuxuged_pufamujixek.pdfIn PDF document text
    • https://patajarixeli.weebly.com/uploads/1/3/1/0/131070073/worewivowigili_wirerigape_wenoberuto_jovilis.pdfIn PDF document text
    • https://sokezimipadivob.weebly.com/uploads/1/3/5/9/135959039/86da7d1b4046e84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458838/normal_60663dfdc9ec3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368956/normal_5ff2da505e683.pdfIn PDF document text
    • https://lewobagapu.weebly.com/uploads/1/3/4/6/134666085/magivadir-kefefivunawisu-xepodituzefad.pdfIn PDF document text
    • https://jixofivibup.weebly.com/uploads/1/3/4/6/134682426/mumarumubifun.pdfIn PDF document text
    • https://xexigajusotojuz.weebly.com/uploads/1/3/1/6/131606060/5592921.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://pejokawigar.pbworks.com/w/file/fetch/144862434/subway_surfers_hack_ios_2020_apk.pdfIn PDF document text
    • http://sapagujedok.pbworks.com/w/file/fetch/144600507/circuit_diagram_of_semi_automatic_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2288dc3f-41c0-4749-8bba-aa45cd107fa2/13863796597.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e15291-cac6-4726-8c59-5fe26e3fae72/85480066246.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

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 5108 bytes
SHA-256: 3a2acb5bf9391c92ab70524e79c72af2d80d26acf5b05f1e113066ea65c5b559
font_01_sfnt_off0000e7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EF 2160 bytes
SHA-256: 41bcfa27daf4fb4d2f4fcef3d1982efa47621a77eb8bd861f6c52b64eef2959f
font_02_sfnt_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 11404 bytes
SHA-256: 2211f69a3c7c488f016639327040b8b071ac8eb3e4afa3fdd5ce983a337026e1
font_03_sfnt_off000118ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118ED 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb
font_04_sfnt_off00012d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D55 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3