Malicious PDF — malware analysis report

Static analysis result for SHA-256 a85a57660887e620…

MALICIOUS

PDF

75.5 KB Created: 2021-03-14 17:08:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e84c1e105700d765a66fdb2bed4f8102 SHA-1: db833c04c09b9fb5dbec702b96bea44f575458de SHA-256: a85a57660887e620690ef1d96358c156c4b5f6c16d36ee0810bec4958c95ce03
136 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains an embedded URI and a high-severity heuristic firing indicating a redirector link, specifically `https://jottigo.ru/wix?keyword=kodak+easyshare+m340+manual`, which is used in a phishing lure for a free download. The document body, though heavily obfuscated, appears to be related to the lure. The presence of embedded JavaScript, though not explicitly detailed in the provided heuristics, is a common method for PDF exploitation and redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://jottigo.ru/wix?keyword=kodak+easyshare+m340+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403679/normal_5fe9430167f87.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412181/normal_5ff087617124e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417526/normal_6046805c9503a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5fe7530471911.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474462/normal_602a6f6b97ffb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426072/normal_5fca4749aac43.pdfIn PDF document text
    • http://kasaxeko.mypressonline.com/44416869216.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetona/jj5hagj/70749767896.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366978/normal_5fee3eb5c12bd.pdfIn PDF document text
    • https://cdn.sqhk.co/kapumikogux/eRohhjd/bluestacks_4_apk_ykleme_hatas.pdfIn PDF document text
    • https://cdn.sqhk.co/mejofiwog/jejagiC/tugezebija.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_60347118d0d94.pdfIn PDF document text
    • http://gimatadokij.mygamesonline.org/sql_scenario_based_interview_questions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415304/normal_5fc9aaa449b2f.pdfIn PDF document text
    • https://cdn.sqhk.co/sivofedexim/agfhezq/4702287795.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca16919-82a1-425c-b1c2-dc147b51e581/fitbit_charge_3_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4c0a75-dc1e-4701-8659-12085dd6b94b/vaxupazedelakadunudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a716b87-7b45-4e56-b789-67801198f403/la_maestria_del_amor_capitulo_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c775cac-237b-4355-b9cb-eec3153a23d8/game_of_thrones_book_6_expected_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aacf4380-8a79-4c03-9dcb-72585498146f/how_to_thread_a_bobbin_kenmore_12_stitch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4fe62c9-d7d6-4b68-998a-4c25b04a90d2/what_is_bios_key_for_hp_laptops.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b8edfb-7466-49c3-9773-1b6f9856ebfd/apc_battery_back_ups_es_350_beeping.pdfIn PDF document text
    • http://nizofikunatafu.atwebpages.com/how_do_ionic_bonds_form_crystals.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F1 5596 bytes
SHA-256: c7bff71835e077a242afd287dd9563c3f849441033cd22c3ef12ca42eb1b9f11
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 11220 bytes
SHA-256: 817458551041573d3dbf2ed02d37af58bea5b128032f7062da494fa9d463d86f