Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78fd838a123c03b…

MALICIOUS

PDF

84.4 KB Created: 2021-04-27 02:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 275bbb84b052dadc10f5591c2de0ef3d SHA-1: 7ef333d50a5b215824af327a955d64d8ebcfbb62 SHA-256: c78fd838a123c03b132b3ff28e7996047d03013123be7593af97cb5c1c2a978f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a large number of external links, characteristic of a link farm, with the primary URL being https://fokemale.ru/strik. The document body, though heavily obfuscated, suggests a lure related to 'where's waldo books', likely to entice users to click the embedded links. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=where+to+buy+where%2527s+waldo+books
    • https://cdn-cms.f-static.net/uploads/4463538/normal_6018cea1a260d.pdf
    • https://nakabupibuf.weebly.com/uploads/1/3/4/6/134608610/bijadegajo.pdf
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5fd64e112ecc5.pdf
    • https://static.s123-cdn-static.com/uploads/4383170/normal_5fcf073963c84.pdf
    • https://cdn-cms.f-static.net/uploads/4486552/normal_5fd7c6fe91db1.pdf
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/niwaro-fulewowuwotijax-mefetuvuse-zinut.pdf
    • http://kakifoliwifeja.iblogger.org/how_to_install_mods_x3_terran_conflict.pdf
    • https://cdn-cms.f-static.net/uploads/4426696/normal_601ed949012d5.pdf
    • https://static.s123-cdn-static.com/uploads/4389353/normal_5fccb5e52066c.pdf
    • https://cdn-cms.f-static.net/uploads/4487386/normal_601b2c12569d2.pdf
    • http://tifanagapi.22web.org/datasheet_lm358.pdf
    • https://linugotozoluj.weebly.com/uploads/1/3/4/6/134662393/8b3569f09b97.pdf
    • https://cdn-cms.f-static.net/uploads/4367646/normal_601de11d0dedf.pdf
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/jizusuxofil-xiwozora-vizodaropevir-xovidin.pdf
    • http://tewezivigu.22web.org/18698492402.pdf
    • https://rakulemiz.weebly.com/uploads/1/3/2/6/132682689/bexoximuvemuf.pdf
    • https://cdn-cms.f-static.net/uploads/4406782/normal_603a9ca420ecb.pdf
    • http://febirag.iblogger.org/82077153670.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://lexizilasajeso.rf.gd/who_slept_with_who_vampire_diaries.pdf
    • http://kokitivem.rf.gd/japeselufenirameru.pdf
    • http://kijolitenelofon.epizy.com/lovenox_enoxaparin_davis.pdf
    • http://kexeban.rf.gd/corneal_ulcer_management_guidelines.pdf
    • http://sowarevom.epizy.com/2019_drz400sm_owners_manual.pdf
    • http://gudonuwoponiri.rf.gd/berlin_definition_ards.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f258.bin
aefb766523806b00d5577954a313257bd48bddd29ecca3d49f1f2dc29992e844		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 3164 bytes
font_01_sfnt_off0000fdbb.bin
676c5c2b4b08ab164178593aaa7f6bf4e1e63321a1564a482e095ebcf1274a29		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBB 5088 bytes
font_02_sfnt_off00010f3a.bin
a444f56af6e139777a5aa9cd450abb14a352417df80f59fead76f71985eafd3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3A 11328 bytes
font_03_sfnt_off0001359d.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1359D 4324 bytes

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