Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb894c82d4696f9…

MALICIOUS

PDF

72.2 KB Created: 2021-03-30 13:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: fbcc7b9e6686b32bb31eaf494085e250 SHA-1: 4d05797bdd701215123fdc9435634441ed7deac2 SHA-256: cfb894c82d4696f9dac4bd0c6b925d9bdf06ff960d88394bb119ea22b3f2402b
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is a phishing or trojan delivery mechanism. The document body, though partially garbled, suggests a lure related to an "answer key pdf". The embedded URLs point to domains that are either unknown or associated with link farms, increasing the likelihood of malicious intent. The presence of external URIs and the overall structure suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=more+reading+power+3+answer+key+pdf PDF link annotation
    • http://megiloreb.mypressonline.com/2038354840.pdfIn PDF document text
    • http://bunowefutop.22web.org/activity_based_costing_questions_and_solutions.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/pcjdCij/gewulolopifubowo.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/98868737992.pdfIn PDF document text
    • http://wojisub.mypressonline.com/77181301588.pdfIn PDF document text
    • https://cdn.sqhk.co/vinogusi/Bhajfii/pitbull_dog_attack_human.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/Zgja2RU/pipataxififixuv.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/bcLjhwW/hamster_life_hack_app.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doriponesarom.myartsonline.com/chrome_adobe_flash_player_is_blocked_2019.pdfIn PDF document text
    • https://9849c7ec-8b19-4b81-9a64-db2537ea7c40.filesusr.com/ugd/97b1c0_8151873836934fd983b9bf4c7121d97d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87185f26-a73a-48c4-af93-1a9ef68b6c48/vasexijuwakexozida.pdfIn PDF document text
    • https://44dd6259-7513-41c7-b2f1-b2b1fc385d2e.filesusr.com/ugd/63022f_5f727e9427444118a12e1c430d51e1cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2656b2f-18ef-4987-b47f-474693c7ac82/1991_chevy_s10_electrical_diagram.pdfIn PDF document text
    • http://jabaxuzadowepep.rf.gd/najugafajep.pdfIn PDF document text
    • http://namavorudil.epizy.com/participle_adjectives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f556bbe-d1c2-406c-9c3a-a9b9f1713ece/my_name_sandra_cisneros_questions.pdfIn PDF document text
    • https://16012499-1299-48b0-8cdd-5f23a7749958.filesusr.com/ugd/fafc38_6764797f53ee4a5f8c1bf9adade3bdc7.pdf?index=trueIn PDF document text
    • https://d21da297-2d1c-4020-882f-059d99c29dc9.filesusr.com/ugd/3724a2_eb366362e8ca427b849feb5ede7910f8.pdf?index=trueIn PDF document text
    • https://684917c6-b594-4497-9ea4-141105166a5b.filesusr.com/ugd/0dc9f5_ba7275f58c274e47a7b6e81bed75270f.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_36e6050c927c4e859787aa98b80bfcd9.pdf?index=trueIn PDF document text
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_7bce723488a64486a8d6910fffa2dabb.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_off0000dc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC07 5604 bytes
SHA-256: 9878a0513ebb309c9e8f658988b4f0c889d7e928b862f770a67d0b97f2c0a048
font_01_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 10576 bytes
SHA-256: d20415e36bdb0bf98f1053d48f3e7d157877f4353a708a9863a6bffa46787b6c

Open this report in the interactive analyzer, or submit your own file for analysis.