Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ef28bb887d92c7…

MALICIOUS

PDF

81.2 KB Created: 2021-03-05 14:44:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 20681630f3fd6ad8e163924a17364b6f SHA-1: 22d040d19c4403325e3c71583e9ca468898b79ff SHA-256: 87ef28bb887d92c7b7be8de63485a13374258f3ad49015894843538fef13145d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and heuristics point towards it being used to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://druttle.ru/wb?keyword=json%20requests%20python%20tutorial PDF link annotation
    • http://saxozumipelezip.22web.org/70058993154.pdfIn PDF document text
    • http://fipoziwebetaz.22web.org/captain_america_background_music.pdfIn PDF document text
    • https://mizemajawoxulu.weebly.com/uploads/1/3/1/4/131437858/9260468.pdfIn PDF document text
    • https://fagesuxolibedif.weebly.com/uploads/1/3/0/9/130969327/gogatupawagofapebab.pdfIn PDF document text
    • http://kaxidabifibag.iblogger.org/bijefadebarimizafawi.pdfIn PDF document text
    • http://popapirim.22web.org/apache_hive_tutorial.pdfIn PDF document text
    • https://mejodedasebedo.weebly.com/uploads/1/3/4/7/134725949/sajabotipitugu-bevarogimazo.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://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_ca6020d8aab84fb7bdc09f02b84b670c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45de033e-bf50-4bca-b5e0-c06f361c115c/logitech_k800_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/toyota_auris_2013_owners_manual.pdfIn PDF document text
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_a2a94fd1873847a0beb5b813cca4d801.pdf?index=trueIn PDF document text
    • http://laneladokeza.rf.gd/gudibidunuzukewu.pdfIn PDF document text
    • https://2d130471-2a64-48ba-87cf-8f1e86c6acad.filesusr.com/ugd/9c43ec_be49de4415474f6b878332bad8e6592b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9c8bcec-a8d8-4796-8727-649db582c039/the_rules_of_the_safe_internet_usage_are.pdfIn PDF document text
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_8d5878e553054054965ad95966118575.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6cd9d7-708d-4c6e-a04b-d8da5541b487/95124131973.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/attack_on_titan_season_3_episode_23_manga_chapter.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_ea3e201ff83a43039ae531ddb0cfb0d9.pdf?index=trueIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_b7b7b1de1385412f91f0b51b59dd2542.pdf?index=trueIn PDF document text
    • https://276658a2-c6b1-4a23-bc3b-56c82bce4278.filesusr.com/ugd/f9448a_844f5ea8f8db4ecda54ba1a017b2a5a7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9deb93a8-9654-4fc3-aa94-c8b6f0943e1d/zodur.pdfIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_bc179b28a51848c0b89c3af61989df39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e1734ef-9ce2-4a5a-9ca0-2557702114e8/presto_cool_touch_electric_griddle_07030_parts.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_off0000f2ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EA 5004 bytes
SHA-256: 5688e191c845dfc20874e0551abf165ac32e3682a1ed81c37fe2fcf60c793b5b
font_01_sfnt_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 10896 bytes
SHA-256: 36956ecb370f4a48af3cf8dacac0303ff4f4cb8df22b1de50b7eda8cc8ec7c23
font_02_sfnt_off00012942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12942 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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