Malicious PDF — malware analysis report

Static analysis result for SHA-256 686836b56197b0ed…

MALICIOUS

PDF

83.0 KB Created: 2021-03-12 18:54:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4f95c9dd199faff63e4c2a97b6ed00eb SHA-1: b6ba5aee8a3258ceea2833c5718f5f11144aa8ef SHA-256: 686836b56197b0edc03c4e0ed98768a72494eba9fde2fc75f25515ccdf5f2a23
104 Risk Score
Tags
free-cdn-ebook-manual-lure

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 high likelihood of malicious intent. The presence of a redirector URL with a search engine optimization (SEO) term suggests a phishing or social engineering lure, aiming to trick users into downloading further content. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • SEO-redirector lure link (multi-word utm_term) low PDF_SEO_UTM_REDIRECTOR_LINK
    PDF contains a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the search-keyword gateway used by the 'free document download' phishing family. Surfaced as an IOC; on its own this is a low-confidence signal.
  • 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://leonvi.ru/123?utm_term=autosketch+free++windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379968/normal_6049f9e0cd9a5.pdfIn PDF document text
    • http://refoxedij.iblogger.org/26055220987.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494139/normal_6002393331595.pdfIn PDF document text
    • http://gagejunifux.22web.org/62827813807.pdfIn PDF document text
    • http://dejenenipanoz.22web.org/4090464930.pdfIn PDF document text
    • http://bodagimama.iblogger.org/what_kind_of_charger_does_a_nook_use.pdfIn PDF document text
    • http://tisimewifexumi.iblogger.org/oh_baby_telugu_video_songs.pdfIn PDF document text
    • http://zivokuj.iblogger.org/best_running_programme_for_weight_loss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://niwimugosaz.onlinewebshop.net/japolezizet.pdfIn PDF document text
    • http://mikusadetov.rf.gd/5_important_facts_about_the_great_depression.pdfIn PDF document text
    • https://s3.amazonaws.com/widuxade/lelujifiziwukabosezixot.pdfIn PDF document text
    • http://nabiderafiwo.epizy.com/2159974767.pdfIn PDF document text
    • https://s3.amazonaws.com/tosego/parokixam.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/vigulupopamujepurorodezi.pdfIn PDF document text
    • http://kopolug.myartsonline.com/93308099490.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/can_i_clean_the_hepa_filter_on_my_dyson.pdfIn PDF document text
    • http://mapixuxiloko.epizy.com/legulekogud.pdfIn PDF document text
    • http://rebobimakefeli.epizy.com/hum_aapke_hain_kaun_songs_musicbadshah.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/docker_for_windows_7.pdfIn PDF document text
    • http://bejopirobi.epizy.com/timowuwajewubopamixoke.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_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 5208 bytes
SHA-256: 16669c4288a7ea5a72f9733ed63c17eed5631417b3c9f489448bc2d822c976b8
font_01_sfnt_off0001187c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1187C 11264 bytes
SHA-256: f94d467e2cf28d6c1deff2c407db1a131e2eac017fd6b571d567397edc4c3aad

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