Malicious PDF — malware analysis report

Static analysis result for SHA-256 877f9ac0f1f07aca…

MALICIOUS

PDF

87.9 KB Created: 2021-04-16 21:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7b72f321e8a67269c72c48cb65e981f1 SHA-1: a078182cea9c0905cfc5c27da7607fd2185e8c2d SHA-256: 877f9ac0f1f07aca71abd944f3a7d281026e83be50432961938f0f262ce4839b
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of an SEO link farm designed to redirect users. The primary lure appears to be a fake specification document for an Acer laptop, which is a common tactic for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/strik?utm_term=acer+aspire+e5-571+specification PDF link annotation
    • https://jabiwogox.weebly.com/uploads/1/3/1/4/131453485/4959823.pdfIn PDF document text
    • https://cdn.sqhk.co/zumufapofow/uie2Gig/boom_beach_hack_ios_download.pdfIn PDF document text
    • https://cdn.sqhk.co/sewujuzanas/SicYidD/detewubuduxasitop.pdfIn PDF document text
    • https://maxolesaso.weebly.com/uploads/1/3/0/7/130776327/benojubixifex_domowoke_gujomomagideli.pdfIn PDF document text
    • https://cdn.sqhk.co/gozawelesutu/fgheCnP/kupizukotuvokuvipewe.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CeW8Yie/rimidozilitimonofitiga.pdfIn PDF document text
    • https://kudilupomirir.weebly.com/uploads/1/3/6/0/136081980/ledoj-mafojel-zuwisujurov.pdfIn PDF document text
    • https://wepejusekubikur.weebly.com/uploads/1/3/4/4/134441987/nebibobunejo_mamojiguvadoba_mefetidoz.pdfIn PDF document text
    • https://nunevebola.weebly.com/uploads/1/3/4/8/134846747/54b7c94.pdfIn PDF document text
    • https://bilurowunolip.weebly.com/uploads/1/3/4/3/134316979/05b86bee00d295.pdfIn PDF document text
    • https://cdn.sqhk.co/xegunorasu/gj2gchg/73747853246.pdfIn PDF document text
    • https://gedaxafi.weebly.com/uploads/1/3/4/3/134340736/tajekipur-kuratifenusutal-dawoxa-sikavema.pdfIn PDF document text
    • https://zuvimetuna.weebly.com/uploads/1/3/5/3/135304981/wabisuxunifizag_rijunuwida_nubidopob_robukoxafina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/roware/rassembler_plusieurs_fichier_en_un_seul.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/3321480028.pdfIn PDF document text
    • http://govujetimavex.epizy.com/88087275841.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/69608353638.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/what_is_the_difference_between_reiki_and_karuna_reiki.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/canonical_transformation_wiki.pdfIn PDF document text
    • http://wojodine.rf.gd/60620834121.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/66192145352.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/dikodusopanadewoxetedu.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/addition_and_subtraction_of_vectors_class_11.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 5256 bytes
SHA-256: 34a17a34a20590a5373399e36d996adb053754172c9f2948d81420f136f8edd5
font_01_sfnt_off0001100c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100C 11228 bytes
SHA-256: 04f536010aa90d730bcf66f95955bffa33e6567d3d31dc4669704cd9d40cf54c
font_02_sfnt_off0001369b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369B 8200 bytes
SHA-256: 574fe95bb9b88342c3e6942ce13fff753937250caa8dff621e7cdc8912430a8c