Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bdc44eb20bba284…

MALICIOUS

PDF

71.0 KB Created: 2021-03-29 02:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3938f47ace0b4cd02de6138d9236cb1e SHA-1: 5c17641f9fd7df37b6758c36fce4e68d1b9873d8 SHA-256: 3bdc44eb20bba28406a3c0474057f115255129a3eab8cf18a18f55d59d748c11
96 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO abuse tactic. One primary URL, https://jumiwimov.ru/aws?utm_term=children%2527s+unfinished+wood+table+and+chairs, is presented in a way that mimics a product listing, likely to entice clicks. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the extensive linking pattern is a strong indicator of malicious intent, possibly for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://jumiwimov.ru/aws?utm_term=children%2527s+unfinished+wood+table+and+chairs
    • https://lixevipilevorox.weebly.com/uploads/1/3/4/6/134634278/158d65087ee.pdf
    • https://luvijitakum.weebly.com/uploads/1/3/4/6/134685142/zuluves.pdf
    • https://ripegedabezigiz.weebly.com/uploads/1/3/2/6/132695689/gixipinijog-gurasajego-patodowev.pdf
    • https://cdn-cms.f-static.net/uploads/4388428/normal_604822ba8bfa5.pdf
    • https://cdn-cms.f-static.net/uploads/4454672/normal_603449fca2f86.pdf
    • https://xalemutaxites.weebly.com/uploads/1/3/0/9/130969461/sinijefevotew.pdf
    • https://cdn-cms.f-static.net/uploads/4498997/normal_600e0a4ef1ef0.pdf
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/puruk.pdf
    • https://buwotudotep.weebly.com/uploads/1/3/1/6/131606539/joxesimavawowapedu.pdf
    • https://static.s123-cdn-static.com/uploads/4467912/normal_5ff2109e29495.pdf
    • https://rutisipileriruk.weebly.com/uploads/1/3/2/7/132740940/70e7522.pdf
    • https://bazopozetera.weebly.com/uploads/1/3/1/6/131637116/ac83f1ca2cddb.pdf
    • https://zewalomoweso.weebly.com/uploads/1/3/4/5/134588134/sifaxipo_gupugajejiwof_nolofevo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5988c8d1-9129-4a15-b9bd-b005a711e01f/lawopizujinufujebugim.pdf
    • https://s3.amazonaws.com/lixisariwulo/manual_de_funciones_y_procedimientos_administrativos.pdf
    • https://s3.amazonaws.com/wemofodi/gijivijowavopamoveku.pdf
    • https://uploads.strikinglycdn.com/files/1310f510-4044-47dd-a33e-7ae885694204/dowupodu.pdf
    • https://s3.amazonaws.com/divexikav/arabic_characters_are_disjointed_and_reversed.pdf
    • https://s3.amazonaws.com/puretulenuza/95991734454.pdf
    • https://s3.amazonaws.com/kifutizijebuj/98010373109.pdf
    • https://s3.amazonaws.com/jujadodedaruxix/1943517456.pdf
    • https://s3.amazonaws.com/jasadavebaga/47340360066.pdf
    • https://uploads.strikinglycdn.com/files/3c507b7b-cf03-4ec5-9223-491a38accc94/how_to_reset_schlage_electronic_door_lock.pdf
    • https://s3.amazonaws.com/ladojenefe/76543512125.pdf
    • https://s3.amazonaws.com/vonuxagupeduze/sobivabe.pdf
    • https://uploads.strikinglycdn.com/files/0debaa54-0831-4432-9adf-53bcd04c1267/what_does_consider_phlebas_mean.pdf
    • https://s3.amazonaws.com/gonafoziguwewe/66398799353.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_off0000d713.bin
56fb66650a05d30121b7fc1d2be967d8c99bd6afeb5d8f5d2462ad6f7ac26772		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD713 5280 bytes
font_01_sfnt_off0000e912.bin
7ef5e1cf67f5a45069bb103bf3ff8157c56ba94e3d92b19ec1e38f5cf3c652ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE912 10712 bytes

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