Malicious PDF — malware analysis report

Static analysis result for SHA-256 7446ee6e412d591b…

MALICIOUS

PDF

81.7 KB Created: 2021-03-22 12:36:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a0a1d100c42f56c4f5fcfbac5632f3e8 SHA-1: 74221e55f7d0a99030a69ebd03306fe6828e3d10 SHA-256: 7446ee6e412d591bd939a9f94592c443f6ab5b5a2bd72bda7e0380457b9fbed3
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which point to PDFs, suggesting a link farm or SEO abuse tactic. One of the embedded URLs, https://golowaki.ru/aws?utm_term=how+to+organize+community+service+projects, is a primary indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/aws?utm_term=how+to+organize+community+service+projects
    • https://duvogepemib.weebly.com/uploads/1/3/5/3/135315067/9546538.pdf
    • https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/489637.pdf
    • https://cdn-cms.f-static.net/uploads/4412394/normal_5fea3695f106d.pdf
    • https://fuxovibafisiboj.weebly.com/uploads/1/3/0/8/130874455/7772161.pdf
    • https://dozexida.weebly.com/uploads/1/3/4/5/134590021/b0409e0e65.pdf
    • https://static.s123-cdn-static.com/uploads/4411229/normal_5fdef54d4fe13.pdf
    • https://mofugitapab.weebly.com/uploads/1/3/4/7/134728490/vavanu-lufamaxonivu-jiwajupexatamu-pasajivevutom.pdf
    • https://cdn-cms.f-static.net/uploads/4371536/normal_602bf585e7b1b.pdf
    • https://dolilifiwu.weebly.com/uploads/1/3/4/4/134401054/6ad890a3c.pdf
    • https://cdn-cms.f-static.net/uploads/4457563/normal_602804c09967b.pdf
    • https://cdn-cms.f-static.net/uploads/4368997/normal_601ac7345292d.pdf
    • https://minileponefij.weebly.com/uploads/1/3/1/0/131070526/xizadaw_tovedeme_titifaven_sutoxitod.pdf
    • https://tiselewo.weebly.com/uploads/1/3/1/6/131606631/9b44275048c87.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/varolexexus/97645133678.pdf
    • https://uploads.strikinglycdn.com/files/e4d50564-6374-4586-92b5-15079e82065b/honda_power_washer_parts_gcv190.pdf
    • https://720c7b34-a033-4bf0-83ea-6be17de98aa2.filesusr.com/ugd/03ef8e_c2dad2152bdc4c9bb1a2b082226a7b32.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4e9eae88-000a-4f01-9b47-1f318ac2de92/bisalirobizimifugebo.pdf
    • https://uploads.strikinglycdn.com/files/6482e409-2bb5-4ca6-af90-8e1188c4b0d1/mibufonipiru.pdf
    • https://uploads.strikinglycdn.com/files/86ad3177-2c13-4f6f-a482-c95a16c45eed/things_wrong_with_american_girl_dolls_are_retired.pdf
    • https://7211abc3-b26e-437e-abd8-8a8c7ebd4af5.filesusr.com/ugd/0683fb_b3c89eaab3eb483f897102a22f32152c.pdf?index=true
    • https://ebc1add8-0b9d-418e-9e4a-1e287827e933.filesusr.com/ugd/ab63e3_0a431308e77d4f2fb3b099e7518b3920.pdf?index=true
    • https://uploads.strikinglycdn.com/files/43a1d0e0-bcfc-4192-823e-41d19ffc4c04/7558194307.pdf
    • https://s3.amazonaws.com/wezukep/industrial_revolution_dbq_answers.pdf
    • https://s3.amazonaws.com/zijivevip/chillara_gang_full_song.pdf
    • https://s3.amazonaws.com/nigimul/81447689771.pdf
    • https://4d75d3c9-3a4d-4df6-84ab-e48b83d723e5.filesusr.com/ugd/cdb50c_0ba5c945d6684d8f948d9fc3de96a452.pdf?index=true
    • 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_off0001007b.bin
c928edb11a4713b3fc47cf91d63f157b6a6eff79cab35a501e1ee09ac5632410		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1007B 5564 bytes
font_01_sfnt_off0001137e.bin
cdc342db576f09a51dfdc9563e5f65f5f8e52948f74279e83acb759587b1e827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1137E 10536 bytes

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