Malicious PDF — malware analysis report

Static analysis result for SHA-256 7742ef2f0e0a9c08…

MALICIOUS

PDF

72.9 KB Created: 2021-03-12 19:06:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2f9c5be270677d7a18fe7b8fa68f7432 SHA-1: 89a373225e38c9767bed6a39112008a1957d60a7 SHA-256: 7742ef2f0e0a9c083c419426f56ed0c1381e0ff9a1bd62f3f9111a35b175c052
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://bologen.ru/strik?utm_term=sta+rite+pool+pump+tank+body PDF link annotation
    • http://onlinetyz.xyz/43730771799v176k.pdfIn PDF document text
    • http://discovljzg.fun/pakistan_studies_book_class_10gckbk.pdfIn PDF document text
    • http://basvuruizleme.online/40462734660116sn.pdfIn PDF document text
    • http://nosinoski.shop/35374610582pbbjv.pdfIn PDF document text
    • http://uscreditcheck.info/tromm_washer_de_codez7h95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_79ec891cdcad40af8d14baefce26a37b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e73c0efb-d4e8-4b59-8bed-9924d8683449/xogarividenuk.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/retelanulilegifofara.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/421b6c3e-3756-42cb-9ba9-44cd83496ce0/frigidaire_portable_retro_6-can_mini_fridge_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/462ab4fe-97f4-4b5a-b8c3-3694ea4556cd/paxepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/990de9a5-1b38-4ea8-b6a7-76be2a742318/vivofibotodu.pdfIn PDF document text
    • https://s3.amazonaws.com/nawuvud/97398422766.pdfIn PDF document text
    • https://f200304d-316b-45a9-b05c-680123ec6d1a.filesusr.com/ugd/aad1a2_98337c3b4a3040629b38bedd8aa7e795.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d463af8a-7874-4edd-9783-0756d3f737ca/how_do_you_remove_a_broan_allure_range_hood.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/icloud_unlock_buddy_2._5_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce69f118-d337-45c2-b285-7470a9fcf05b/vejaf.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/rowepenemebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e0e5ae-f59e-4312-a418-b28018cad0d2/free_html_css_templates_for_ecommerce_websites.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_6896aadf33cc4beb9b9bc70183eec3ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/68555efc-ccb8-4fba-8445-904dbf3ccc4e/bugaboo_frog_stroller_weight_limit.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/wavomalanolatazevovavaz.pdfIn PDF document text
    • https://fa202315-5cd5-4006-9a99-7c5d4406650e.filesusr.com/ugd/61804c_bd9cfb0e582e4b31a89e7476d7b16492.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f53c26d5-b637-42a5-a69f-f7ae1713ec5a/hatha_yoga_pradipika_swami_muktibodhananda_deutsch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a47386c9-0f4e-4e5a-846c-ab230d2edba4/fomoferubokefonopu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e789af11-0ce9-4220-b541-86e728e51f74/who_is_the_girl_in_episode_4_of_the_mandalorian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7432c61-454c-407e-bc2e-f64f0dc4945d/19889870097.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_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 5336 bytes
SHA-256: 5e43aa0108ff49b200463379cff50181452971fb6411dbd5cb5898377ec11fe5
font_01_sfnt_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 10712 bytes
SHA-256: e8a6eee8c48003d159e3b0a6171963f6a57db1b8ad373fa86ec31aabba74b44a