Malicious PDF — malware analysis report

Static analysis result for SHA-256 109cb9aae50316d0…

MALICIOUS

PDF

88.6 KB Created: 2021-03-25 16:43:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b59f2690fbdd9c9ea23bab368cc2b3b SHA-1: e5bf17d031c1d1cf8992db47a7202e94211c52fa SHA-256: 109cb9aae50316d086952be7530521829bdac2246cbe7de1a44da9101b08d920
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 a phishing or trojan threat. It contains numerous URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to trick users into downloading software, as suggested by the 'utm_term' parameter in one of the URLs. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no clear textual lure.

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://xezojetit.ru/123?utm_term=hungry+shark+latest+version+mod+apk
    • http://1pokypki.website/cognitive_behavioral_therapy_for_dummies2lf89.pdf
    • https://cdn-cms.f-static.net/uploads/4367311/normal_60118675a51e1.pdf
    • http://tomolijoponix.mypressonline.com/chapter_26_cold_war_conflicts_test_form_a_answers.pdf
    • http://gojevomarokabe.getenjoyment.net/27839538831.pdf
    • http://3gusevshop.space/google_earth_android76d9d.pdf
    • http://redpandarecycling.com/winchester_model_74_scope_mountluzm2.pdf
    • https://static.s123-cdn-static.com/uploads/4454995/normal_5fe4d9b7542b5.pdf
    • http://zizodoroluxonaf.sportsontheweb.net/memotip.pdf
    • http://afracheat5.xyz/ds2_drakeblood_greatsword_buildgin6l.pdf
    • http://demask.space/66_books_of_the_bible_tagalog_listxxf9k.pdf
    • http://tetizeniwa.mypressonline.com/mnemonica_free.pdf
    • http://zanodopowe.sportsontheweb.net/administration_of_estates_act_1925.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_39d9a796b1c24531a828da340130c1ed.pdf?index=true
    • https://e028ba52-6c86-493e-86b7-fecf7cd1c3eb.filesusr.com/ugd/bcb9fd_487181b5b311481791fed58650f74964.pdf?index=true
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_2f9978337f704a7dab05a6da11a08eee.pdf?index=true
    • http://bajupigirosinaf.atwebpages.com/78208008909.pdf
    • https://s3.amazonaws.com/gasodamuza/alfonsina_storni_obras.pdf
    • https://s3.amazonaws.com/wukevirenesu/chivas_regal_ultis_1_litre_grand_format.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010259.bin
31055851765187fd0be7b8bb2e5ebd6a4a2efcbf53f41a682e589f6bb7840749		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10259 16808 bytes
font_00_sfnt_off0000ef95.bin
da13fcfa20fb1a3a33fd76441a86f1a5d2432b8f076f6330a1ee152c7740917a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 5560 bytes
font_02_sfnt_off00013100.bin
a39bdb7172510a526bd5ae23db129aec2da5d01be36187718bb3618b32d15270		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13100 10376 bytes

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