Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bda9748b3814b3…

MALICIOUS

PDF

81.4 KB Created: 2021-03-24 02:14:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7cbe42361939e3b6cb19d34ae69a98a9 SHA-1: 1cde58f9eb124fe928d7da13ca87601e31e5fa15 SHA-256: 88bda9748b3814b30da83b649ed1986b94c9e00f006c56e793f0f5891ee949c4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicative of a phishing or malware distribution scheme. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs strongly suggest an attempt to redirect users to malicious content.

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://maypoin.ru/award?keyword=airfix+model+world+april+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/xoresarib/LjcnIMb/can_am_defender_xmr_hd10_top_speed.pdfIn PDF document text
    • http://sy0n.icu/tumipokegakiwotoot5kx.pdfIn PDF document text
    • http://tifowudadu.22web.org/51960845321.pdfIn PDF document text
    • http://mosuxuvemuzuwex.mywebcommunity.org/burden_saxophone.pdfIn PDF document text
    • https://cdn.sqhk.co/botuvawezej/jilhcBB/77519702471.pdfIn PDF document text
    • http://hh666o.site/bezalitijerugd2rvq.pdfIn PDF document text
    • https://cdn.sqhk.co/bomoxale/Zd7ZChi/share_files_my_cloud_home.pdfIn PDF document text
    • http://yewes.fun/domain_and_workgroup86qko.pdfIn PDF document text
    • https://cdn.sqhk.co/gobenebovi/Hjig6ic/surviv._io_wiki_weapons.pdfIn PDF document text
    • http://setixin.iblogger.org/50588378717.pdfIn PDF document text
    • http://faxixovojaja.sportsontheweb.net/44497957786.pdfIn PDF document text
    • http://yarrebitteh.online/mexican_whiteboy_themes3vwgz.pdfIn PDF document text
    • http://sulelufisumi.iblogger.org/35139764100.pdfIn PDF document text
    • http://pokemonrivals.online/did_mountain_dew_get_rid_of_brominated_vegetable_oilch6ar.pdfIn PDF document text
    • http://healthit.space/mackie_1604_vlz_pro_monitor_setupmibw2.pdfIn PDF document text
    • https://cdn.sqhk.co/jipogidara/ggiciaA/hulu_plus_amc_channel.pdfIn PDF document text
    • https://cdn.sqhk.co/zimofuzam/idzhibU/freeze_dance_halloween_music.pdfIn PDF document text
    • http://pmaider.com/hibbeler_dynamics_13th_solutionsn7rnr.pdfIn PDF document text
    • http://matteset-spon.space/baby_gates_for_stairs_with_banisters_no_drillingjcgso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sonowodiguvab.epizy.com/canada_election_platform_guide.pdfIn PDF document text
    • http://zilowovuv.atwebpages.com/18772026231.pdfIn PDF document text
    • http://kagokonutuvep.epizy.com/reading_test_1_answers_the_falkirk_wheel.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 5032 bytes
SHA-256: 30017a551659d14231516f527093973311c18b3d19c8a7de4786511ca299b211
font_01_sfnt_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 12080 bytes
SHA-256: 86c9b265ad35aade3c4f4532eae2f35b1dc79130d2c4ef1d7efe606553122ded
font_02_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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