Malicious PDF — malware analysis report

Static analysis result for SHA-256 940574fd8611cba9…

MALICIOUS

PDF

70.1 KB Created: 2021-03-24 10:57:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cd89c7ab68aaa29f47576b82cb52a67b SHA-1: 6cc244eeb0902e53fdc1f5adfb86ba80e171350c SHA-256: 940574fd8611cba9bca3ffb7ba857f79e53ccd4393ffdcb36cde8ca1280f70bc
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The primary malicious URL, 'https://resalured.ru/award?keyword=focused+antenatal+care+in+nigeria+pdf', suggests a potential SEO poisoning or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to distributing further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/award?keyword=focused+antenatal+care+in+nigeria+pdf PDF link annotation
    • https://likerediweraj.weebly.com/uploads/1/3/4/6/134691167/dotapikag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_6012ecf5628b7.pdfIn PDF document text
    • http://yesstore.pro/gokebapuo228c.pdfIn PDF document text
    • https://cdn.sqhk.co/jijatidos/tSijhfF/13651901723.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/dlFv6JA/valentine_s_day_cake_ideas_pinterest.pdfIn PDF document text
    • http://japancar-sib.ru/best_board_game_to_play_online_with_friendsmbdcu.pdfIn PDF document text
    • https://cdn.sqhk.co/zedazisem/5hhid1s/vejora.pdfIn PDF document text
    • https://suligabewe.weebly.com/uploads/1/3/4/0/134040343/282478.pdfIn PDF document text
    • https://danexuxubusam.weebly.com/uploads/1/3/2/6/132695747/4c3ddff4df18f.pdfIn PDF document text
    • https://suxamoka.weebly.com/uploads/1/3/4/8/134876373/kokukitesiputorade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452609/normal_6007311dbdd6c.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/969c5ef3-77f4-40f6-8326-ee77ed0182f0/50108992598.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae96a996-55db-458f-a971-0922558e8a03/does_keto_pure_diet_pills_really_work.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_14647d506e414948ac9e0684d053a935.pdf?index=trueIn PDF document text
    • https://0524119b-9543-44d4-a9c1-6a2a85ae2681.filesusr.com/ugd/b12506_2464dbc8d101476489a137671202b7ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a38b3ebd-be4d-4b3f-8e6c-0ffde59553c1/neguwilijafa.pdfIn PDF document text
    • https://f74ea38a-ab8d-49a0-8d31-9a1d7ce64423.filesusr.com/ugd/5ceade_88247e036abf4708853b7f020b8db48f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec697ea-3066-4b07-a6d3-a5c8f095567b/what_is_lucida_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74a4b683-134f-4532-831f-cdfbd2a1ecdf/doll_house_furniture_au.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_c6ae9c9571e54d539b961c0e69b8df46.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_off0000c909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC909 5160 bytes
SHA-256: 2edbbfcfcc01abd2f8ad925e87aa7272e7b8b5d3239e15f282aa1bac4c9722eb
font_01_sfnt_off0000da9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9F 9960 bytes
SHA-256: 61278bc58179baf7469a23df186d8feda2c45935c5e7ed90f1141e96af9a2c01
font_02_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378