Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8b2d30d8927865…

MALICIOUS

PDF

82.9 KB Created: 2021-05-08 13:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3cde54a64eb9d79a0e90944e6f257a9 SHA-1: ee1f3b376e0b35bb8acb832762d5c94968e9a05a SHA-256: 3e8b2d30d8927865bd488cbd3c8c791290a893ff6c3ea38b394af9338616a832
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many of which are hosted on disposable domains and utilize SEO-related keywords in their paths, suggesting a phishing lure or a link farm for malware distribution. The PDF structure itself does not contain executable scripts, but the presence of external links and the high detection scores strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://botokaw.ru/strik?utm_term=5+steps+to+ease+lockdown+northern+ireland
    • https://lefagetali.weebly.com/uploads/1/3/2/3/132302894/tepofisivire-pejedurun-daruze-sixesikapaxudi.pdf
    • http://keborejozupe.22web.org/what_is_the_best_apollo_dirt_bike.pdf
    • https://patobozojewe.weebly.com/uploads/1/3/4/8/134863794/vawegivegixomut_suvonizud.pdf
    • http://rotosararazazi.22web.org/how_much_compression_should_a_5_hp_briggs_and_stratton_have.pdf
    • http://gopilorujisuse.iblogger.org/9905540303.pdf
    • https://lugutorajuma.weebly.com/uploads/1/3/4/8/134882305/93658a9ea.pdf
    • http://dexuposi.sportsontheweb.net/ratunekarojepalelomatabu.pdf
    • http://zofanelo.22web.org/89570084610.pdf
    • http://busapibasin.mypressonline.com/baby_bible_stories.pdf
    • https://morewunopidov.weebly.com/uploads/1/3/4/8/134895133/842845ca52dbbb4.pdf
    • http://doxugivo.22web.org/android_versioncode_vs_version_name.pdf
    • http://tevopose.66ghz.com/aerodrom_nikola_tesla_informacije_telefon.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/welanisowari/45776791697.pdf
    • http://gofikezepo.rf.gd/posthumanism_neil_badmington.pdf
    • http://gitavini.epizy.com/the_mortal_instruments_city_of_bones_movie_2013.pdf
    • http://lusujukelod.epizy.com/sibekejinuj.pdf
    • http://kiduvunizujenav.rf.gd/nugifigavasesomud.pdf
    • https://s3.amazonaws.com/kujapomib/85015189698.pdf
    • https://s3.amazonaws.com/biwuwukesazef/mutixamazasobuxizowofo.pdf
    • http://rurebirafana.epizy.com/pengertian_abortus_inkomplit.pdf
    • https://s3.amazonaws.com/xakapudakadu/palukituweja.pdf
    • https://s3.amazonaws.com/xisefowu/legobake.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e2.bin
cc74f848d381e6597ae6c4b03c076498e46b78cd221f1ef13a801ceefdd81757		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 5136 bytes
font_01_sfnt_off00010b54.bin
b64b04351f176d626dd848f63fd422d6befea8d28d645c56baa41e0bbac35159		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B54 10560 bytes
font_02_sfnt_off00012f65.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12F65 4324 bytes

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