Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a69db41e8425e15…

MALICIOUS

PDF

73.8 KB Created: 2021-06-08 19:40:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f4c47ff566d3f9a0eb2567c114f9b1ac SHA-1: 38022e4b874783aabe7d5cb8d254eb33960b458c SHA-256: 8a69db41e8425e1568993d6823839fd6d8c4f721a84cb8bbc54cd80968543aa1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9996

Heuristics 6

  • 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.
  • 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://coretry.ru/pbw?utm_term=anna+todd+after+we+collided+read+online PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369773/normal_603800e880b39.pdfIn PDF document text
    • https://xigogedamexov.weebly.com/uploads/1/3/1/3/131384098/774521a8a.pdfIn PDF document text
    • https://kofotugul.weebly.com/uploads/1/3/7/5/137503506/5148497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467019/normal_600fa45c3f7d2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401714/normal_5ff693ec5258b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489601/normal_604ec5cb5173d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_6017dbd867cb5.pdfIn PDF document text
    • https://bisubobotikimix.weebly.com/uploads/1/3/1/4/131438323/puwefiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468296/normal_5fd2853eb5690.pdfIn PDF document text
    • https://guxafosiwu.weebly.com/uploads/1/3/1/4/131453681/dinukomomunux.pdfIn PDF document text
    • https://koxepapo.weebly.com/uploads/1/3/3/9/133997229/8502872.pdfIn PDF document text
    • https://jafedemigizol.weebly.com/uploads/1/3/4/5/134588438/fowukexaza_zofotide_metomoxe_legobuvivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490251/normal_5fc7c6fd22307.pdfIn PDF document text
    • https://dujejasafat.weebly.com/uploads/1/3/0/7/130739214/4917167.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
    • https://uploads.strikinglycdn.com/files/f002c047-3072-4ff3-9f7b-6e1df032414a/how_old_are_2008_babies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f540ff87-dbbd-4172-8e4b-152dad761e75/full_and_final_settlement_letter_format_in_microsoft_word.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1928f7c9-5792-4ff2-9674-fb3285800e30/how_many_cans_of_baby_food_does_wic_give_you.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bc1997c-1585-4294-90cb-462c4cf79c61/romeo_y_julieta_cigars_no_2_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2de4840-eb52-4be3-9b1c-9c5d512ecc42/41736124954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7526fb-826f-4997-864d-5ec6f6e96723/what_is_the_largest_sector_in_the_us_economy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97e7affe-1502-4bde-9ec3-f139da49cb0a/how_to_find_probability_density_function_of_uniform_distribution.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0A 4704 bytes
SHA-256: 9afc492a28e47140a64ffded6b64f1dd974718bdccc89b3fe3ff6a8cc5c66ceb
font_01_sfnt_off0000ea18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA18 10060 bytes
SHA-256: 1313b799014efa4cf2f07beb541adbad69765af59d19e235538f92c867baca59
font_02_sfnt_off00010ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333