Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e38e839b5cc607d…

MALICIOUS

PDF

78.4 KB Created: 2021-04-19 22:55:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c9e3328b2103d2baaf2ced31d79e384 SHA-1: 546901ec0dcb43a0faa0d1eac992533ee94fc8d8 SHA-256: 1e38e839b5cc607df66d7688255e76fe67151bb732e2ce68201ddc77f7855078
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated PDF documents, suggesting a link farm or SEO manipulation tactic. One prominent URL, 'https://gimoguvi.ru/strik?utm_term=average+starting+salary+of+data+scientist+in+india', is directly embedded and likely serves as the primary lure. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://gimoguvi.ru/strik?utm_term=average+starting+salary+of+data+scientist+in+india
    • https://cdn-cms.f-static.net/uploads/4501645/normal_6041550f58c0f.pdf
    • https://kavasudominid.weebly.com/uploads/1/3/0/8/130813783/xilewotot_memexabenatuv.pdf
    • https://totakolexab.weebly.com/uploads/1/3/5/3/135391630/913579151d.pdf
    • https://static.s123-cdn-static.com/uploads/4405946/normal_5ff9c4b3891d0.pdf
    • https://cdn-cms.f-static.net/uploads/4379613/normal_604ce6449fd31.pdf
    • https://lidanoliki.weebly.com/uploads/1/3/1/3/131380598/nefenituxavejas-jupot.pdf
    • https://kutusavirub.weebly.com/uploads/1/3/4/2/134265758/423141.pdf
    • https://lotatodekimin.weebly.com/uploads/1/3/4/7/134705716/8ff96f48.pdf
    • https://saditifoba.weebly.com/uploads/1/3/5/3/135325123/fivinenexit-zusozibutud-mividuniwakawo.pdf
    • https://tonituligavu.weebly.com/uploads/1/3/4/8/134884188/92cdb6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gurupixabogivaz/35193766101.pdf
    • https://uploads.strikinglycdn.com/files/40f11a0f-ed29-40f8-9d82-41d945609610/8049285392.pdf
    • https://s3.amazonaws.com/zizene/jitetibifipinedijox.pdf
    • https://uploads.strikinglycdn.com/files/3edb0ed2-8ae3-428c-ad1a-b5a98bf2a8ee/81102852238.pdf
    • https://uploads.strikinglycdn.com/files/cbe44c66-ced2-4ff3-b70d-f5f9bde2861d/what_is_agrarian_revolution_in_the_philippines.pdf
    • https://s3.amazonaws.com/rivazixexuguri/bias_fx_1.pdf
    • https://uploads.strikinglycdn.com/files/067aa787-1f08-4113-9f78-0a79913424df/citizen_eco_drive_titanium_chronograph_wr100_gn_4w_ul.pdf
    • https://uploads.strikinglycdn.com/files/e47931db-0989-4544-8983-35a14dfc46c5/why_is_it_important_to_recycle_paper_and_cardboard.pdf
    • https://uploads.strikinglycdn.com/files/51547ad9-0039-462a-ba56-8b7a1f6fe2f3/how_to_connect_hp_deskjet_2541_to_wifi.pdf
    • https://uploads.strikinglycdn.com/files/fc9382c6-e28f-4e29-8105-c70ae500a5d9/reading_comprehension_questions.pdf
    • https://s3.amazonaws.com/dewazewokib/46907751612.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01a.bin
3fdbea9aefadd4caf7764c0de294839ab19ece460f10b09c3052987c1a5339f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF01A 5340 bytes
font_01_sfnt_off0001026a.bin
b268dfeb6c7b4309af29676a16a8750d7967c9d4330ea4d267c9fc56974a0064		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1026A 11604 bytes

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