Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd27b48a30662990…

MALICIOUS

PDF

73.2 KB Created: 2021-03-24 02:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a0aecb2f166f73f1526e88c516165ba8 SHA-1: bb1890a8363add2cef745f5aedb268d0d2889522 SHA-256: cd27b48a306629908874465e37eecdc20331863b52ad8f70f8f9f4732df59949
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to a link farm hosted on weebly.com, and a primary redirector URL. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' indicate a deliberate attempt to create a network of links for SEO manipulation, likely to funnel users to malicious content. ClamAV detection and ML classification further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/strik?utm_term=compaq+presario+cq57+charger+near+me PDF link annotation
    • https://fisokifife.weebly.com/uploads/1/3/4/3/134340906/158802.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_601bd749d81b9.pdfIn PDF document text
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/3553310.pdfIn PDF document text
    • https://labekefetimobu.weebly.com/uploads/1/3/0/7/130739294/widibumaxerexa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393625/normal_5ffac07eb24d5.pdfIn PDF document text
    • https://fiwofufoneronup.weebly.com/uploads/1/3/1/0/131071066/sibujegir-bofekilulal.pdfIn PDF document text
    • http://spain50off.info/naruto_shippuden_episode_87rm57x.pdfIn PDF document text
    • http://milatepe.medianewsonline.com/architecture_ebook__building_design_and_construction_handbook.pdfIn PDF document text
    • http://my-favshope.online/44875918012z6t9a.pdfIn PDF document text
    • http://reawont.online/girlfriends_guide_to_divorce_abby_pregnant9lwfv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369631/normal_5ff9c12a05cac.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/best_resistance_band_exercises_for_chest.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/lavasuw.pdfIn PDF document text
    • https://wubudonujekud.weebly.com/uploads/1/3/4/5/134524452/nawolotoxozugo.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/gupojakami/chemistry_sol_review_guide_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/93180600364.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/kerevamunebajavi.pdfIn PDF document text
    • https://s3.amazonaws.com/kukazowox/kisazoraxaxaj.pdfIn PDF document text
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_fd0cf3e0321b4e6ebf9ea61b58ee9007.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/91475739301.pdfIn PDF document text
    • https://cd489911-dc6d-4439-b408-84622343fb93.filesusr.com/ugd/d8e941_0c96ea475c8d4974bd9d6b1f14532b2c.pdf?index=trueIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_09a71ac344ed4a93bf1678e82731a8f9.pdf?index=trueIn 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_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 5552 bytes
SHA-256: 13ea2fc350306944c6c09bbf4eb8e3f3ce903d97e9d43b95bebd055ddcb8f1f8
font_01_sfnt_off0000efba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBA 11232 bytes
SHA-256: 17cf0c4652c2e61e160024ffdc144a5af77a0cb17cafd38646ef4690f93d752c