Malicious PDF — malware analysis report

Static analysis result for SHA-256 c94fd513e096873c…

MALICIOUS

PDF

112.5 KB Created: 2021-03-15 12:34:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0385cdc64c20ea3ec2f1445e4964fac6 SHA-1: 78de8826c05263b4a3eb6e0ca7797429c110af8f SHA-256: c94fd513e096873c076286024a815af97cd1db7831f9583fea8775836370ec70
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded URLs and the document's structure suggest it's part of a link farm designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dafemum.ru/123?utm_term=libram+of+voracity+quest+guide
    • http://toppiksnack.xyz/88167612619fxxum.pdf
    • http://fuvisetitisenon.mypressonline.com/kojemujadejorenowivaj.pdf
    • https://cdn.sqhk.co/gituridewo/hjhhPqe/27211485944.pdf
    • http://laludinemolat.sportsontheweb.net/verewakipudupopopikox.pdf
    • https://gikanusubidi.weebly.com/uploads/1/3/4/7/134756500/2600251.pdf
    • https://cdn.sqhk.co/kidatufo/hahf7hf/13108381693.pdf
    • https://cdn.sqhk.co/runusamopit/bidjdDC/vector_definition_biology_a_level.pdf
    • https://cdn.sqhk.co/noperizapewo/ohha9gh/fox_racing_trackside_gear_bag.pdf
    • http://ipatovaalena.ru/crank_ellen_hopkins_free_onlineot4qu.pdf
    • https://fezulenigi.weebly.com/uploads/1/3/4/4/134485980/ziwop.pdf
    • https://cdn.sqhk.co/votojuxosaf/hbhedid/black_hills_badlands_mount_rushmore_gypsy_guide_yellowstone.pdf
    • http://muwiduvepobuz.mygamesonline.org/11239346124.pdf
    • http://lupelisizi.medianewsonline.com/seluj.pdf
    • https://bategasef.weebly.com/uploads/1/3/2/7/132712490/2616324.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vexosafugunu/37097152835.pdf
    • https://s3.amazonaws.com/bogijexu/38655057827.pdf
    • https://s3.amazonaws.com/resisuna/fosazemitumawuzawigelixat.pdf
    • https://s3.amazonaws.com/niporofez/windows_10_update_assistant_filehippo.pdf
    • https://s3.amazonaws.com/juzowilipi/inbound_marketing_certification_answers.pdf
    • https://s3.amazonaws.com/sizadagazagaj/sigobuxuvokifed.pdf
    • https://s3.amazonaws.com/faluzotixupi/alveolar_hypoventilation.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112e8.bin
964bc231f39c5aa9d8e74d92e8a85629ef9ef9482938c594e6dd2ccd395e8cc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x112E8 34928 bytes
font_01_sfnt_off00017e7b.bin
87d4d660131d9a222e1f6688e81f3ea652484ffb6284f00af466105d157f0473		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E7B 5680 bytes
font_02_sfnt_off000191be.bin
160ff384ab3a866009800a6d1411f240eb7df2e55a63ed007ea7220132dc3b46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x191BE 10120 bytes

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