Malicious PDF — malware analysis report

Static analysis result for SHA-256 90fd03596f23ef0b…

MALICIOUS

PDF

76.8 KB Created: 2021-04-17 16:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 13b6aa08b7264859e6dd897470aebc72 SHA-1: 07764b33d6b50a121292063977335f7416435ad4 SHA-256: 90fd03596f23ef0bbea9176aeead933807805aa553e01989d1bb15732b7e7e7b
186 Risk Score

Malware Insights

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

The sample is a PDF document that impersonates Facebook to phish for credentials. It contains multiple external URIs, including one pointing to a redirector hosted on weebly.com, which is a strong indicator of a phishing campaign. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the presence of external links and the phishing lure are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://basisini.weebly.com/uploads/1/3/4/7/134775363/fafelezuw.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.
  • 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://fokemale.ru/strik?utm_term=what+kind+of+oil+does+a+2005+chevy+malibu+take PDF link annotation
    • http://gewusoluxul.scienceontheweb.net/gesepaxatere.pdfIn PDF document text
    • http://igoscandinavia.com/honda_zoomer_x_service_manualanfb4.pdfIn PDF document text
    • http://hightrade.club/romeo_and_juliet_law_comzpsqe.pdfIn PDF document text
    • http://sdorovie-sustavi.xyz/how_to_bypass_a_craftsman_lawn_mower_seat_switch31m6u.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/wefopek.pdfIn PDF document text
    • https://basisini.weebly.com/uploads/1/3/4/7/134775363/fafelezuw.pdfIn PDF document text
    • http://onlinetiser.website/family_financial_budget_spreadsheetwye1x.pdfIn PDF document text
    • http://hyipinvest.site/how_to_operate_a_panasonic_phone6g3fj.pdfIn PDF document text
    • http://libopadu.scienceontheweb.net/72602080886.pdfIn PDF document text
    • https://dazowuxope.weebly.com/uploads/1/3/4/3/134319454/gimivagej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/usda_ppq_form_526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ff2a735-1988-4ac3-bc55-c97fb5d0b75f/is_there_a_difference_between_dog_and_cat_flea_medicine.pdfIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_f7e1fe11ae794711a06a385d5b9f189b.pdf?index=trueIn PDF document text
    • http://benamow.myartsonline.com/tekulavomininoberome.pdfIn PDF document text
    • https://s3.amazonaws.com/dipafuxe/bosch_dishwasher_junction_box_melted.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/13537353992.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/directory_commands_in_linux.pdfIn PDF document text
    • http://bemabam.myartsonline.com/pretty_little_liars_episode_guide_season_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6955b6e-50f1-4d0a-a9fc-4d96c1a27347/how_to_adjust_casio_watch_strap_metal.pdfIn PDF document text
    • https://e3e1c2aa-7f41-47b0-8c2f-d823cb48b857.filesusr.com/ugd/7598fa_7927bf8dc65b4e299b310417e2a8fcb8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirofopafu/22295445600.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_8ae523cb7c4542ba961000ea982afb2d.pdf?index=trueIn 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_off0000e1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E4 2900 bytes
SHA-256: 10a07fc969e6c8cf41398fcfefa625e426b29a45b33f3716d0886db1405c0d2a
font_01_sfnt_off0000ec27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC27 5940 bytes
SHA-256: c79cafa8fa23244f1a35fbdc0b9f650b5bae764d0c9a57722c68bf6ed89a691d
font_02_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 10904 bytes
SHA-256: b482280bc2ef9c958b6bfd5f55c5ff789b1285caa07a9999acbe88b1f7f70ea8