Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d041d2eeaa564d…

MALICIOUS

PDF

75.9 KB Created: 2021-03-17 13:27:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6313c1b95b9fbcd07c6802b43f14330e SHA-1: 9429c9a7edd0e23a21c2666a73c71e9b6febb218 SHA-256: 74d041d2eeaa564d278ac5f2f74b379462974504a38b12fd2f2dcbe1ce1e2db5
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous external links, with a significant number pointing to potentially malicious domains, indicative of a link farm or phishing operation. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest an attempt to redirect users to malicious 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://lozipotod.ru/123?utm_term=template+latex+ieee
    • http://fobativ.mywebcommunity.org/pusokobamiwidezitulev.pdf
    • http://bagawixaj.mywebcommunity.org/71803187036.pdf
    • https://dapiridefurewej.weebly.com/uploads/1/3/5/9/135987432/9174897.pdf
    • https://vijamosikafej.weebly.com/uploads/1/3/4/7/134772382/xojiwijar_perosu.pdf
    • https://kojozoxilasa.weebly.com/uploads/1/3/5/3/135302893/jiteserudu-wujebuxibat-xerodewudif.pdf
    • http://degakak.sportsontheweb.net/23329206058.pdf
    • https://wufovepujiz.weebly.com/uploads/1/3/0/7/130775368/vowot-nipatidapenuxu-wizolukevubas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xowilewegiwo.myartsonline.com/addendum_to_lease_agreement.pdf
    • https://uploads.strikinglycdn.com/files/85811a05-e163-4c1b-8afe-9eddab68be0c/49597872246.pdf
    • https://uploads.strikinglycdn.com/files/617ff98b-a471-4594-bcaf-1487acc1e2d9/persuasive_essay_topics_for_elementary_students.pdf
    • https://s3.amazonaws.com/wetevali/white_as_a_sheet_meaning_in_telugu.pdf
    • http://pezamax.myartsonline.com/mechanism_of_oxidative_phosphorylation.pdf
    • http://dejujerun.rf.gd/nibitijegajosiketafom.pdf
    • https://s3.amazonaws.com/telasebisu/65619847803.pdf
    • https://s3.amazonaws.com/likerajatob/23074109813.pdf
    • https://s3.amazonaws.com/divexikav/gixiranirex.pdf
    • https://s3.amazonaws.com/memexelu/vofabojana.pdf
    • http://rabuvof.rf.gd/marvel_schebler_carburetor_parts.pdf
    • https://uploads.strikinglycdn.com/files/b2acd1f5-8224-465c-a70e-b597a17c06cd/fitbit_charge_hr_bands_jb_hi_fi.pdf
    • https://s3.amazonaws.com/jukoxisojow/choriocarcinoma_cancer_information.pdf
    • https://uploads.strikinglycdn.com/files/4791c866-0c7d-4490-b5ef-ac8c59fbea11/stickman_battle_super_shadow_unlimited_money.pdf
    • https://s3.amazonaws.com/sedowedi/vocabulary_for_ielts_speaking.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_off0000ed22.bin
65766cc239b67ad165d2c80cabeab467a885f238e00d2365174d7391515975fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 4708 bytes
font_01_sfnt_off0000fd13.bin
9fae8fa067591eda7b575814be849cba5393b7e28cd62e2ceae2945eeee5c87a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD13 11212 bytes

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