Malicious PDF — malware analysis report

Static analysis result for SHA-256 853000ab6dd61f0e…

MALICIOUS

PDF

86.1 KB Created: 2021-03-25 12:02:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3fbb3c78cde0c83c74671550fed933ee SHA-1: 21a2ba2f61e83176a7a1e403ab89ca79b4e09c8a SHA-256: 853000ab6dd61f0ed5816513e0d809cd306e7d5cea0de4632bab83679bb7062b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically for brand-impersonation credential phishing. It contains multiple external URIs, including one hosted on weebly.com which is identified as a link farm on disposable hosting and directly linked to the phishing lure. The document body is heavily obfuscated and does not provide clear textual content, but the heuristics strongly indicate a phishing attempt targeting Amazon users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://nenejiremox.weebly.com/uploads/1/3/0/9/130969141/gezelamax_tulikuxo_menop.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://leonvi.ru/wix?keyword=kindle+fire+user+guide+online PDF link annotation
    • https://nenejiremox.weebly.com/uploads/1/3/0/9/130969141/gezelamax_tulikuxo_menop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451756/normal_6046ccdb052d5.pdfIn PDF document text
    • http://baby-slings.ru/7802301888nbp22.pdfIn PDF document text
    • http://simcars.ru/what_are_the_basics_of_civil_engineeringc76rt.pdfIn PDF document text
    • https://popetufuwude.weebly.com/uploads/1/3/1/4/131483025/1919414.pdfIn PDF document text
    • http://gtomishebs.xyz/aqa_psychology_a_level_textbook_year_2h84x1.pdfIn PDF document text
    • http://specrazreshenie.com/ruzejudegrxdz.pdfIn PDF document text
    • http://istlan.space/singer_touch_and_sew_626_reviews849kw.pdfIn PDF document text
    • https://bimotozego.weebly.com/uploads/1/3/4/8/134885309/939462.pdfIn PDF document text
    • https://satisetuxa.weebly.com/uploads/1/3/0/8/130813646/16ec01c53.pdfIn PDF document text
    • http://ttop-shop.com/how_to_play_no_rules_fifa_21_onlinebeiv7.pdfIn PDF document text
    • http://rivalo130.com/singapore_math_kindergarten_dimensions2thid.pdfIn PDF document text
    • http://tehnoprom.org/wiweraberogawmqiz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414501/normal_5ff17890c79d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476443/normal_6033717bb2e4c.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/f7ea017d-7f84-40d2-bf75-0ec201300848/7172413546.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/dubbed_anime_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/chuck_season_3_480p.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a63d98-9a2d-4e09-8307-f5bbd4d47767/how_do_i_control_the_volume_on_my_samsung_smart_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c3ccea6-bf72-4e5e-85ca-752179ba25a1/24517833454.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/rogasadigiwisatoxekeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b729a507-da0f-426f-a207-10a25e41ee29/7511921672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86647d9f-6f14-4f7c-978c-af05abff2aac/apc_back-ups_xs_1500_software_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/jatemodamisasubapa.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/34908436575.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_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 4636 bytes
SHA-256: a7ffa50da2c88009a4bb3579c215c183a6330322de80c07b4f79b3beb32d9fc3
font_01_sfnt_off0001179e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 10796 bytes
SHA-256: 2a7a88b966caf04e96ece6371de7c4c3d4935bc50d9e1fd1d7d6eabe94dd0aa7
font_02_sfnt_off00013c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C98 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378