Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0b46f342ce0176…

MALICIOUS

PDF

74.6 KB Created: 2021-05-14 19:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f3b57692c12e4f239919c90cc773c14 SHA-1: 70f20b72f2bb71e625b7d2453826cc7d87e4506d SHA-256: aa0b46f342ce01767b5ced143528308d45fa33a44fb03740c3e02ba4c26e06e0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are obfuscated or point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crophysi.ru/strik?utm_term=how+to+find+the+disney+princess+filter+on+tiktok
    • https://cdn.sqhk.co/dosakupu/hdhdy7X/92668345924.pdf
    • http://jijimaxugixu.22web.org/authentication_problem_wifi_android.pdf
    • http://bepifukikuku.mygamesonline.org/97315767029.pdf
    • http://vatemuredaxusob.22web.org/best_reader_for_ipad_with_annotations.pdf
    • http://mekarafa.iblogger.org/topokuma.pdf
    • https://cdn.sqhk.co/lamiwifa/idhjjhd/truck_racing_game.pdf
    • https://cdn.sqhk.co/vadetegubufo/Ygfoegj/tetupa.pdf
    • http://maxiteguf.medianewsonline.com/dowinozatope.pdf
    • https://cdn.sqhk.co/vugasoveg/56bgQgc/815427705.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d7d9470a-9784-4c28-ac68-b1ab0f70ddf3.filesusr.com/ugd/148484_884d3be5ffab4acb8e6c42ef176d76e4.pdf?index=true
    • http://gebaruzowulidus.epizy.com/89519541075.pdf
    • https://s3.amazonaws.com/jufowokedunod/likufisurut.pdf
    • https://s3.amazonaws.com/wovigebi/rajya_khadya_suraksha_yojana_form.pdf
    • https://s3.amazonaws.com/jagux/angular_7_formcontrol_set_focus.pdf
    • https://73e8eba8-f08a-4c12-987a-519a82e171c2.filesusr.com/ugd/19159f_ed4d612e5ac34c1bb36ece763817938d.pdf?index=true
    • https://db6d201d-bdff-4648-9982-d9cfaac7639e.filesusr.com/ugd/98857b_7b12a7c8a047450ea1c8f153c6c0daf7.pdf?index=true
    • https://s3.amazonaws.com/xowasosuf/cert_format_types.pdf
    • https://s3.amazonaws.com/wofaxil/trigonometric_functions_word_problems.pdf
    • https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_8c633f0508af488d9fcc8408f791cc9c.pdf?index=true
    • https://dbb1fad9-9c05-458f-9e32-bc0b7f65d7ec.filesusr.com/ugd/451461_af47f76eb74f4388a75643c8461b9778.pdf?index=true
    • http://mugosovexu.epizy.com/asus_x510ur-_bq292t_manual.pdf
    • https://s3.amazonaws.com/zozuxukoxo/donugaromomowetapi.pdf
    • https://s3.amazonaws.com/vezumobigodub/96804178036.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_off0000e7ca.bin
23129973f280f88b0f95ffcf93089867ae0162605e58694691e14b624a7b1f9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7CA 5252 bytes
font_01_sfnt_off0000f9c1.bin
72cf0b3cce0a4015cae2508dfb478205ae6797aebdfe33f27fcb1b73fdc4e551		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C1 10296 bytes

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