Malicious PDF — malware analysis report

Static analysis result for SHA-256 f520c88f695a1945…

MALICIOUS

PDF

83.5 KB Created: 2021-03-02 19:23:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c024638d4b621fe2a57ea5e469f5019b SHA-1: a517850cb0974d720693dfa18178e2436ca8f7da SHA-256: f520c88f695a194514ad8aba5da1305c7901c9f902a9ed21aecd8cdf27bc05e1
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest an attempt to exploit users through redirection, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=atlas+copco+900+cfm+compressor+specs PDF link annotation
    • https://cdn.sqhk.co/weruvewo/TgjEmib/spaceflight_simulator_pc_controls.pdfIn PDF document text
    • https://retotanenumu.weebly.com/uploads/1/3/4/0/134017544/wivurijeforika-zutelabadosasu-pitugozapodu-bokexelotape.pdfIn PDF document text
    • http://wesabelilunu.22web.org/lanegodogumaz.pdfIn PDF document text
    • https://ganakinupep.weebly.com/uploads/1/3/4/5/134599301/36cde.pdfIn PDF document text
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/gagafuteri.pdfIn PDF document text
    • https://turabebusaweni.weebly.com/uploads/1/3/1/4/131438207/ziziwegagofi_vokemutanu_wawupateditevuz_jafonofuda.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/bKgjheX/dental_assistant_jobs_edmonton_ab.pdfIn PDF document text
    • https://xoxoxiwozolem.weebly.com/uploads/1/3/0/7/130739626/sigasujir_suboz_koropabe_rujozogamu.pdfIn PDF document text
    • https://pixipemojawipe.weebly.com/uploads/1/3/4/4/134459682/runazixejevumap.pdfIn PDF document text
    • https://basurujilitafap.weebly.com/uploads/1/3/4/5/134595952/03aa9e671601.pdfIn PDF document text
    • https://vizokajobekaxa.weebly.com/uploads/1/3/0/9/130969885/60eed7c4336f.pdfIn PDF document text
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/naxikutozipowu_rixizur_salimigegu_zavofusi.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/GBUMShg/chicken_poultry_lake_charles.pdfIn PDF document text
    • http://www.opentle.orgIn 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://vibizimejup.rf.gd/13738829912.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/fixinefejenugonoluje.pdfIn PDF document text
    • https://s3.amazonaws.com/zarusegibitumet/93664634971.pdfIn PDF document text
    • http://pivutabomenatam.rf.gd/guidewire_software_inc_malaysia.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/woxowarefaganasoruguf.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000e6f2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE6F2 14632 bytes
SHA-256: 074bad4f278fe3bed755047423bd722a7f306fa2968d98a1ca2a4e63b8bd3cd3
font_00_sfnt_off0000d5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C2 5084 bytes
SHA-256: 146affb30359fea2720588330e511e509c8347bc9217a96f894a6482a3b44659
font_02_sfnt_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 10240 bytes
SHA-256: 26b656a285141e8831a632fd3659d6431945e4f007e19950343317796b2343c9
font_03_sfnt_off00013221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13221 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176