Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d381a25cb6298c1…

MALICIOUS

PDF

81.7 KB Created: 2021-04-01 23:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2c62bf51d01e0b64fcc1485ccff06e97 SHA-1: 70f3be3a5250d7a986334cc1f6ac85a48d3dbace SHA-256: 3d381a25cb6298c1f21644a31ac30f4ff947a47433d643ffd09b424e70858cb4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9954

Heuristics 5

  • 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 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://dafemum.ru/strik?utm_term=el+pollo+loco+double+chicken+avocado+salad+recipe PDF link annotation
    • https://cdn.sqhk.co/vafegijateno/heb6ibW/37678200299.pdfIn PDF document text
    • http://pojibuvuj.mygamesonline.org/actitud_definicion_psicologia.pdfIn PDF document text
    • http://penexej.mywebcommunity.org/gupagepomirojupoga.pdfIn PDF document text
    • https://cdn.sqhk.co/midubevine/m5Rjihh/28974040177.pdfIn PDF document text
    • https://nukarefu.weebly.com/uploads/1/3/4/1/134131348/3930840.pdfIn PDF document text
    • http://pagavopalubutu.scienceontheweb.net/capitalismo_socialismo_e_democracia_schumpeter.pdfIn PDF document text
    • https://cdn.sqhk.co/lotidonita/gsrghii/directv_discount_packages.pdfIn PDF document text
    • https://gefimopawudomew.weebly.com/uploads/1/3/4/0/134017284/gafodedeveloj-ganij-parunigemefus.pdfIn PDF document text
    • https://patawera.weebly.com/uploads/1/3/4/1/134131312/wapegevidenopox_gunonewoteg_rudunikamivup.pdfIn PDF document text
    • http://rejawulomov.mywebcommunity.org/critical_point_of_water.pdfIn PDF document text
    • https://cdn.sqhk.co/numiwufeguv/e5ogjga/buffalo_gold_super_free_games.pdfIn PDF document text
    • http://topukovatawosu.sportsontheweb.net/brucellose_bovine.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://s3.amazonaws.com/sorapobuk/causes_of_the_great_depression_document_based_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5375bae-2310-4fef-b544-e1f715ed763a/77793258034.pdfIn PDF document text
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_b2975a9b20a148caa4340c311f02a7f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/luborinizu/76596452051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/300b37cd-7420-4762-bb57-e87637b03103/89571868979.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78fa5724-601c-4a5d-b19e-572c0042c1dd/google_chromecast_h2g2-42_jp.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_67119efdfcba4795b2547d3e2da8d32c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76c5eb9-e658-4293-b8a5-a05e103450a8/11954100577.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/metal_gear_solid_5_when_does_quiet_leave.pdfIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_0912fc735d7d4c3b941df8b875ecb677.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pegebunov/17584841584.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/5062201457.pdfIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_943083fa75384df8897b15f9d8e887dd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb72c156-28cd-4198-9ad3-2516b0057b5f/quadratic_formula_solving_methods.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_off0000f2be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BE 5184 bytes
SHA-256: 0c6546ed45974c9044628a1ba6a3552b02e766bdd6078ecc662b9ac3580d65b8
font_01_sfnt_off00010441.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 11280 bytes
SHA-256: 91df2a49268a845dcea804e2d671cde78dbb0fa36e0dab71565bde45d4adc52b
font_02_sfnt_off00012abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3