Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c616753f23024dc…

MALICIOUS

PDF

74.3 KB Created: 2021-03-17 04:58:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a31b2a7854f7099e5938ef9b1da08916 SHA-1: b7ef0c741645eb143d14b974dc5eca218cbcf672 SHA-256: 1c616753f23024dc75d40d965ccf1b1ef1c5d356e1c68984be1c70ba615b6c42
136 Risk Score

Malware Insights

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

The PDF file contains a high-confidence ML detection and a ClamAV signature indicating it is a phishing trojan. It includes an embedded URI and a redirector link that points to 'https://xezojetit.ru/strik?utm_term=how+to+make+netgear+n600+as+access+point', suggesting a lure for users to download or visit a malicious site. The document body, though heavily obfuscated, contains text related to the URL, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=how+to+make+netgear+n600+as+access+point PDF link annotation
    • http://zujuzerawijuk.medianewsonline.com/asrock_z87_pro3_overclocking_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409250/normal_602b756a6661e.pdfIn PDF document text
    • http://salonlabs.xyz/somewhere_over_the_rainbow_lyrics_judy_garlandtnr1j.pdfIn PDF document text
    • http://fresh-ita.space/dream_interpretation_death_of_own_childketu7.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/1422976333161nqb.pdfIn PDF document text
    • http://livecopyrightverification.com/1960_cessna_182_owners_manualvatbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_601729d37b0f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_600fa703e9dc8.pdfIn PDF document text
    • http://autoport76.online/greek_gods_and_goddesses_family_tree_worksheethg8px.pdfIn PDF document text
    • http://allerlo.xyz/37430240114my1cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411001/normal_600d4416a0df0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459463/normal_5fdab42a9bd6e.pdfIn PDF document text
    • http://lagejarejitog.mypressonline.com/xekuxilinabufisadesetar.pdfIn PDF document text
    • http://bbflowers.net/dyson_cinetic_big_ball_animal_upright_vacuum_manualxey5s.pdfIn PDF document text
    • http://galosidijixiwu.mypressonline.com/juzike.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/basic_notes_of_c_language.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/career_values_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/free_pptx_templates_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/abbyy_transformer_plus_kaufen.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/pevojozoginuzol.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/algebra_1_linear_equations_worksheet.pdfIn PDF document text
    • http://jitawidavez.atwebpages.com/toto_toilet_st743s_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/guzujarekizozabuxomap.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/6873540694.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_off0000e41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41D 5632 bytes
SHA-256: 953c78c2259cc6cf41dc2e4d5dfc24d588643a78ed0aca416a9aa63c00c237e0
font_01_sfnt_off0000f740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF740 10708 bytes
SHA-256: 42bee1bf11347e95518cc15857cf0492227f496a13be6a7756882cdafe73bdd4