Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11751218dd0c8e0…

MALICIOUS

PDF

96.5 KB Created: 2021-04-07 20:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c5c333bd7e8c15d03fb89ca7472e8b23 SHA-1: 27f2e7f1e897c790daab01985a16d23bbb189b1c SHA-256: e11751218dd0c8e06066aec4b0ccf79132e85aaef299880bb518ecf020d48ef6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF documents hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous external URIs and the link farm heuristic strongly suggest a malicious intent to distribute further content or mislead users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/wix?keyword=sd+card+recovery+apkpure PDF link annotation
    • http://biomaniix.website/evaluation_circuit_electrique_5emes2hyt.pdfIn PDF document text
    • http://rukozhop-guide.com/3350553979ox17m.pdfIn PDF document text
    • http://betflixguvenilirmi.com/in_the_mood_glenn_miller_orchestra3tbe2.pdfIn PDF document text
    • http://mexicotop.xyz/mantenimiento_correctivo_ventajas_y_desventajasl6y58.pdfIn PDF document text
    • http://levelupguild.com/topunagiji60q00.pdfIn PDF document text
    • https://sigurapefudaji.weebly.com/uploads/1/3/4/5/134576843/rabajotifoliridixi.pdfIn PDF document text
    • https://turabebusaweni.weebly.com/uploads/1/3/1/4/131438207/292f191c78.pdfIn PDF document text
    • http://idealicaitalia.website/capello_clock_manual_ca15qhgne.pdfIn PDF document text
    • http://my-favshop.online/android_auto_review_sync_3dbdpv.pdfIn PDF document text
    • http://ita-bio.fun/86514024173bk59g.pdfIn PDF document text
    • https://povisegidugukab.weebly.com/uploads/1/3/1/8/131871963/kagedafos.pdfIn PDF document text
    • https://lesezisuwo.weebly.com/uploads/1/3/4/1/134109364/072c1e5adf5f.pdfIn PDF document text
    • http://shoop-ff.ru/67215291741xrssw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_e842460e8bb441069d025b9fafdde5f2.pdf?index=trueIn PDF document text
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_970829cdeae64d7d961888fea2936e15.pdf?index=trueIn PDF document text
    • https://d9e21584-559d-470c-b0e9-829a80f361fa.filesusr.com/ugd/989f82_8af1907fc1004ff38dc56ef26b52269a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rudelazifizuvo/xedexuribejisajikuzuzaf.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/45830191402.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/baletufefolif.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 5188 bytes
SHA-256: e3a0eb52a9c262c13c30b3d51a948c584b61f0bcf86d76086b9ffd3407e5b578
font_02_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 9112 bytes
SHA-256: f813190bbce4ac44fd9b9f3fe5c2cc0b7b25177c1731471d6d42a8d2524e571b
font_03_sfnt_off00012b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9E 11320 bytes
SHA-256: d0913f6cc62ad87bf37e8d8d0c8ebf24c40f001fbc7093a6883e6d54be5a4276
font_04_sfnt_off00015273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15273 17028 bytes
SHA-256: 6f0d84ca95789ee5be0c214bd1b37c5d9a6bd1e775e02a755267425cd94733d8
font_05_sfnt_off00016a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A69 1748 bytes
SHA-256: 89fa29acab38c978a8362044e3ca8de4fbed59094ec07a994917d34c24379b1c

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