Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1bb26c530289fe0…

MALICIOUS

PDF

82.3 KB Created: 2021-04-05 19:42:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f7432502d25e2a04196adf05f76896c2 SHA-1: 502f1344105da698e6538b7d2da490f4a592dcb4 SHA-256: c1bb26c530289fe0578423d777af21cf32dc306bb4aa7f00402e77d18b624973
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious redirection or content hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/123?utm_term=charminar+kannada+film PDF link annotation
    • https://cdn.sqhk.co/bureruverog/fjaLQFn/81407847922.pdfIn PDF document text
    • https://cdn.sqhk.co/rasufizo/VFijkWV/microban_sanitizing_spray_citrus_sds.pdfIn PDF document text
    • https://xixekelubijaruj.weebly.com/uploads/1/3/5/3/135329585/6dccbb5e5.pdfIn PDF document text
    • http://onsideball.info/siwedowekufezowuperonko6ym.pdfIn PDF document text
    • https://durapafived.weebly.com/uploads/1/3/1/4/131438767/zurezab_vanogigukotukup_tetal_wudelibo.pdfIn PDF document text
    • https://cdn.sqhk.co/foropogajag/hjw3Ohb/sozum.pdfIn PDF document text
    • https://divozurov.weebly.com/uploads/1/3/1/4/131437474/6963051dc18.pdfIn PDF document text
    • https://rotalexabif.weebly.com/uploads/1/3/1/3/131381819/9537343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_606760ab949c3.pdfIn PDF document text
    • https://puwegamojone.weebly.com/uploads/1/3/4/7/134702565/pogopekunuxu.pdfIn PDF document text
    • http://tiktokfrance.fun/thermaltake_core_v1_snow_edition_mini_itx_chassisju53g.pdfIn PDF document text
    • https://nibawisid.weebly.com/uploads/1/3/1/0/131071209/6201594.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478703/normal_5ffcdff7a3b77.pdfIn PDF document text
    • http://olipaka.xyz/54727227467pd26e.pdfIn PDF document text
    • https://bikizulotozenap.weebly.com/uploads/1/3/1/8/131860645/fobarosumepo-zezajipolo.pdfIn PDF document text
    • https://deremufirig.weebly.com/uploads/1/3/4/8/134854029/4c6270499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460055/normal_5fe3ff46a00c4.pdfIn PDF document text
    • http://summerita.fun/chunky_heel_platform_booties4dafj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428035/normal_6056ab7f4855f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/41716516855.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/self_certification_form_minnesota.pdfIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/64088149098.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/41913959828.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/57789165770.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_off0000e3c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C2 4536 bytes
SHA-256: 7025ff8e5904bdeb95333c7a07bce045d19b328e3e6e913d640097450bc8b8b5
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 10744 bytes
SHA-256: 585f089617f502887a70a113b25fb26598372c5827bb1d5ce6cae9d97dfc2f43
font_02_sfnt_off00011808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11808 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd
font_03_sfnt_off00012d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D35 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f