Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc6fc0cacdb51f5…

MALICIOUS

PDF

109.9 KB Created: 2020-11-20 23:41:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8b1d59d4c888823de8f5e42af7a56ae9 SHA-1: b9f361ad21b6511c97f8c75bb0910605e945c1b4 SHA-256: 6bc6fc0cacdb51f52054eee61acf722dcdc48765b8676ff434f42a85e67f8a22
234 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous external links suggests an attempt to redirect the user to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://traffine.ru/aws?utm_term=abacuses+plural+form In PDF document text
    • https://wugebanog.weebly.com/uploads/1/3/4/7/134709888/5719715.pdfIn PDF document text
    • https://didokizobu.weebly.com/uploads/1/3/4/7/134711826/wesokugiri-dunasuv-dogibed.pdfIn PDF document text
    • https://kufazijofiw.weebly.com/uploads/1/3/0/7/130776126/092f8.pdfIn PDF document text
    • https://wizemeleg.weebly.com/uploads/1/3/4/3/134307012/b6f4cc13daec1.pdfIn PDF document text
    • https://wojuguzibuliru.weebly.com/uploads/1/3/4/8/134896427/7d96c.pdfIn PDF document text
    • https://mitixomog.weebly.com/uploads/1/3/4/8/134859124/sutemamidozeguv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/90764658447.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/kenodamosatuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5374b6e2-30fe-4ed9-82af-1c5317bc527e/tutexupanigovefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dea1ddf-a722-4582-9251-74701302b258/xutipofefi.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/neragaporinub.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/likajelaregujilumuxazofu.pdfIn PDF document text
    • https://s3.amazonaws.com/lulelepese/letter_of_recommendation_for_college_student.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/xifasokozoja.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/aegisub_karaoke_template.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/first_order_kinetics_drug_elimination.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AC7 6004 bytes
SHA-256: cc61c334ff23b67b6676a2921d2edc88b68e5053ec26ac2c6c530b677f140e22
font_01_sfnt_off00014f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F99 5288 bytes
SHA-256: 2b3eb90d701b8046e9a0baedaef73729596620c916349fa90e273dcbc8579c26
font_02_sfnt_off0001617e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617E 17560 bytes
SHA-256: 2599f4bc16d03668b1de6da07944bb596e9a081963bc1e57b323aa9147682398
font_03_sfnt_off000194f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194F9 16060 bytes
SHA-256: 5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330

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