Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf8304d4afd26f7…

MALICIOUS

PDF

65.7 KB Created: 2021-03-16 22:58:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 2c7ec637b017569cfb9d89ac8e6cfa2f SHA-1: 6a27d9ad8714d31506aa0307ded3cfcf8adbc351 SHA-256: ddf8304d4afd26f708a6de9209965d2ee87d50626c638d1d5759347b47263ab2
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary URL pointing to a site offering a 'metal weight calculator formula'. This suggests a tactic to manipulate search engine results or to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/award?keyword=metal+weight+calculator+formula+pdf PDF link annotation
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/4586271.pdfIn PDF document text
    • https://junerokiwoji.weebly.com/uploads/1/3/0/7/130775834/kugogonab.pdfIn PDF document text
    • https://litolojinoforiw.weebly.com/uploads/1/3/4/7/134721995/f8229814e45fd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0438306-09c1-42ef-8197-c660399bcd71/11387313890.pdfIn PDF document text
    • http://nuxizutize.rf.gd/cursive_writing_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/2008_jeep_wrangler_unlimited_x_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59879be-80d2-4455-b3ba-816bc964ca34/fatesededitesikaguvija.pdfIn PDF document text
    • http://galisatuvuvos.rf.gd/lenovo_g50-80_laptop_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21e62d6d-1969-4087-bdf0-6dadf3d70837/97765736503.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/truecaller_name_and_location.pdfIn PDF document text
    • http://lodusebivepakef.epizy.com/necchi_sewing_machine_model_bu_1951.pdfIn PDF document text
    • https://s3.amazonaws.com/jaloto/piwopijoladaxugeti.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/what_is_sub_caste_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/xofalepelala/how_to_clean_chicco_keyfit_30_infant_car_seat.pdfIn PDF document text
    • http://tuzugewidided.rf.gd/ravupixupubojixerulakag.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/43442587662.pdfIn PDF document text
    • http://gafelen.epizy.com/measles_encephalitis_case_report.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_off0000c4dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DD 5488 bytes
SHA-256: 30a3ed91ecde9de4ff54674495fc4c58b1082307de1dc60ac5d762ad776ad622
font_01_sfnt_off0000d77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77F 10076 bytes
SHA-256: 9474f570ae1b09ff988f03db68226cd5f6486685afb1ec19f3a9326424162afe

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