Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a5d6349a31af0ff…

MALICIOUS

PDF

74.5 KB Created: 2021-03-01 06:16:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: b70ffc2ade89f881cc975838cbedbfcb SHA-1: c92e226f7af51748c5ed1de80003c72da799f222 SHA-256: 8a5d6349a31af0ff7dee7291f38b2bd211f68d0032f4a73cb04eaf537305914b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are SEO-themed and point to potentially malicious domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to search queries, reinforcing the lure. No scripts were extracted, but the PDF structure and embedded links are indicative of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://kuzutuzo.ru/wix?keyword=dusty+rhodes+auditor+property+search PDF link annotation
    • https://lagomide.weebly.com/uploads/1/3/5/3/135304015/13669af06.pdfIn PDF document text
    • http://gadetebes.sportsontheweb.net/mini_bike_repair_shop_near_me.pdfIn PDF document text
    • https://kajovagej.weebly.com/uploads/1/3/4/7/134747054/lozafebajo_bujororumofam_rulafifos_seguwig.pdfIn PDF document text
    • https://dewajijivixire.weebly.com/uploads/1/3/4/6/134638152/nusoviji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467975/normal_601e044a63eb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407807/normal_600c199e3ea1c.pdfIn PDF document text
    • https://wufodiwefoveve.weebly.com/uploads/1/3/4/8/134891768/7a35e9041.pdfIn PDF document text
    • https://vomimefime.weebly.com/uploads/1/3/5/3/135316042/8603408.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/mcculloch_chainsaw_pro_mac_10-10_parts.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389793/normal_5ff288f19e1ee.pdfIn PDF document text
    • https://toxobeveja.weebly.com/uploads/1/3/1/4/131437160/4033273.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/rejiner/love_of_my_life_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/endometrial_hyperplasia_treatment_guidelines_acog.pdfIn PDF document text
    • https://s3.amazonaws.com/xovekolamoxe/tolkien_beowulf_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/maze_runner_movie_download_in_tamil_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/measuring_and_constructing_angles_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/behringer_bcf2000_manuale_italiano.pdfIn PDF document text
    • http://vunonam.atwebpages.com/gamawobopikofafetafeju.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/91693771783.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/emulator_ps2_untuk_android_2018.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F9 5232 bytes
SHA-256: 6bbae7b3c13c5b01fc5e6527097cd8fcb0a5ce39b0845a9deb6c198bd081122f
font_01_sfnt_off0000fac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC7 9792 bytes
SHA-256: 670c84aa427357e6f4613d3435a8098226d8939e270eb484ec00105987f04e4f

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