Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c54e1416fa1f30…

MALICIOUS

PDF

80.7 KB Created: 2021-03-15 22:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c0d32b44815e1ee77f8589d8ff28d3b SHA-1: b3f74945f1051109f906032bbb9ec25923650dbf SHA-256: 36c54e1416fa1f306891dac31f462b246b465a7fe0757f2c8fcf7a19df4a7466
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF SEO link farm. One of the primary external URIs points to 'dafemum.ru', which is likely a malicious domain used for distributing malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=the+importance+of+being+earnest+analysis+sparknotes
    • https://sikefenuvip.weebly.com/uploads/1/3/4/0/134012601/votudirubur-setojetozad-nowebobuxufumev.pdf
    • http://simcars.ru/sareduruxevupacs96l.pdf
    • http://fitokapss.xyz/android_10_for_samsung_phones3b4cn.pdf
    • https://fekebejoluxoji.weebly.com/uploads/1/3/4/3/134309121/wowiwed-woxorizepitaz-xuragabef.pdf
    • https://turonobofudub.weebly.com/uploads/1/3/4/4/134463989/654873.pdf
    • http://rafale.store/153357981421plyi.pdf
    • https://pixavegabub.weebly.com/uploads/1/3/5/3/135307945/gijiridire_jonesogoze_tukotuwugileka.pdf
    • https://gapefupekud.weebly.com/uploads/1/3/1/8/131871489/3945578.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/766c4bba-a29a-483f-b545-8d851358a119/9805882448.pdf
    • https://uploads.strikinglycdn.com/files/ac39da6c-4996-44dd-94ab-5bf15b6d4db9/japilivaratufuvatanulafi.pdf
    • https://uploads.strikinglycdn.com/files/6b50ff53-bc9d-47ae-bf2a-bf0c49015999/hydro_flame_furnace_8525-11.pdf
    • https://uploads.strikinglycdn.com/files/3e144284-66a6-440a-82b1-a68503487393/babusijuzurokesosusewig.pdf
    • https://uploads.strikinglycdn.com/files/c7a0af7a-d41f-4c22-9c1d-babcb900f5c4/millermatic_135_for_sale.pdf
    • https://uploads.strikinglycdn.com/files/78449b2e-6f7f-4c80-9454-fa2718e63f9f/data_structures_in_c_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/7c14bb97-a175-46a1-a56c-7c431b2c15a1/turtle_beach_px22_ps4_anschlieen.pdf
    • https://uploads.strikinglycdn.com/files/411dbe95-c4a0-40a2-85f8-27d395f53b60/2825313100.pdf
    • https://s3.amazonaws.com/setigafat/gebok.pdf
    • https://s3.amazonaws.com/remavuj/catalyst_2960x-_48fpd-_l_datasheet.pdf
    • https://uploads.strikinglycdn.com/files/54284906-9372-43ce-98f6-99c7c1efa1dd/return_of_service_form_washington_state.pdf
    • https://uploads.strikinglycdn.com/files/8fc6701e-24f1-463c-bde5-6168933e2735/tufebomerimi.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_off0000fd92.bin
33d6afdee32dbc3dde9a1b01e8ce8eac1ff0b3aaa6708adc7f2707fe7f705694		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 5684 bytes
font_01_sfnt_off000110c3.bin
e416ee851cde077192ffc461c0294a9b53436b5aa1f55135eefeabdb8429a70b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110C3 10608 bytes

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