Malicious PDF — malware analysis report

Static analysis result for SHA-256 677ee9189f739c40…

MALICIOUS

PDF

91.9 KB Created: 2021-03-16 18:53:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 78f4095ce34e41baa6593659c94bc173 SHA-1: 4f3be4d4d9a22bfbf7c54e2fa23f717eb93566c5 SHA-256: 677ee9189f739c40ad07d8dcd48c1df1eb985a6baf5ea46ad8e8037e5c4c0f28
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, with critical heuristics identifying it as a PDF link farm. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, possibly for phishing or SEO spam. While no scripts were explicitly extracted, the PDF structure and numerous external links point towards a malicious intent to drive traffic to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://seumenha.ru/strik?utm_term=the+children%2527s+hour+play+monologues
    • http://itclick.pro/no_limits_race_to_sunglasses_satin_carbon_black5clmx.pdf
    • http://re-capital.ru/le_plan_comptable_mauritanien0b3jp.pdf
    • https://cdn.sqhk.co/dikizumi/ii8jajg/bricknoid_2_brick_breaker.pdf
    • https://cdn.sqhk.co/tewokozogop/hcRS7Sl/vazojomifotugiwulopizo.pdf
    • http://shop-profildoors.ru/does_audacity_work_on_a_macb5smx.pdf
    • http://acupofjacob.com/61082644743ylh0o.pdf
    • http://grenkasalo4.xyz/95043741777hqrh8.pdf
    • https://cdn.sqhk.co/kefekawit/jIiYifQ/new_english_dj_audio_song_download.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jazamerijekufol/vabikutez.pdf
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_11e1b7fb6ed04dedb4e7ec837293682c.pdf?index=true
    • https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_d5412bb5edf3409cbf51f451964b2ed9.pdf?index=true
    • https://s3.amazonaws.com/sugowubuf/panew.pdf
    • https://s3.amazonaws.com/bejexe/89522388111.pdf
    • https://s3.amazonaws.com/jebokizez/what_is_in_harry_potter_advent_calendar_2020.pdf
    • https://s3.amazonaws.com/rimepusox/pabibufokar.pdf
    • https://s3.amazonaws.com/firudegix/tamurapowar.pdf
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_64efd1afb273472b84a7ad78e4a986c6.pdf?index=true
    • https://s3.amazonaws.com/poresi/renav.pdf
    • https://s3.amazonaws.com/mipizaju/41856536123.pdf
    • https://s3.amazonaws.com/kosipefojaw/spinal_anaesthesia_anatomy.pdf
    • https://s3.amazonaws.com/fatikonavori/4610221578.pdf
    • https://s3.amazonaws.com/purufiz/9601670116.pdf
    • https://s3.amazonaws.com/marimejerebo/arcade_cabinet_diy.pdf
    • https://s3.amazonaws.com/fipijife/wovomepame.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011155.bin
0df99cff82b87b9aa3a78197c90984820f5bd7783117ce99cf605b126c0094ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11155 5572 bytes
font_01_sfnt_off0001242b.bin
c41926b389cf2996065c6a243b2fa01bf3d6b87803538347bb9bcf5d95c11796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1242B 11596 bytes
font_02_sfnt_off00014acc.bin
99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14ACC 16060 bytes

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